"With this in mind, I feel now is the time to seek a new challenge.
"I'm delighted to be joining Tianjin TEDA FC at a time that the Chinese Super League is really taking off, and I look forward to helping Tianjin TEDA FC continue to grow.
"To play in the Premier League is every professional player's ambition.
"But to play for Chelsea, to become part of the Chelsea family to work with some of the best managers and players in the world, has truly been an honour.
Mikel is the second Chelsea player to move to the Chinese Super League in recent weeks following Oscar's transfer to Shanghai SIPG. BBC contributed to this report.
⚽ Alli stars as Spurs end Chelsea's 13-match winning streak
Dele Alli's ninth and 10th Premier League goals of the season proved enough to end Chelsea's winning run.
Tottenham ended Chelsea's attempt to make Premier League history with a 14th successive victory as the title pacesetters were well beaten at White Hart Lane.
Spurs moved up to third place as headers from Dele Alli either side of half-time made the difference to leave Chelsea five points ahead of Liverpool in second place.
Alli rose to meet Christian Eriksen's cross in first-half stoppage time and the same pair combined to put the game out of Chelsea's reach in the 54th minute.
Eden Hazard had Chelsea's two best chances in each half but Spurs closed out the victory in comfort to put north London rivals Arsenal out of the top four and leave themselves seven points off the top after their fifth successive league win.
Spurs have won five straight games in the Premier League
Tottenham's season was at a tipping point after a disappointing Champions League exit at the group stage and the poor performance in defeat at Manchester United in early December - but they have responded magnificently.
Mauricio Pochettino's side are gathering impressive momentum, illustrated by the manner in which they overcame a Chelsea side that was starting to carry an air of impregnability.
The 4-1 wins at Southampton and Watford served as a warning that Spurs were approaching the sort of form that carried them close to the title last season and this performance confirmed their growing confidence and stature.
Spurs have recaptured their intensity and energy and when this is bolted on to the quality provided here by the likes of Alli and Eriksen, it makes them a formidable prospect.
Manchester City had already found Spurs too hot to handle at White Hart Lane this season - and Chelsea suffered a similar fate.
Alli delivers the goods
Alli's first (left) and second (right) goals were remarkably similar efforts
Alli endured a quiet start to the season, perhaps in the aftermath of England's debacle at Euro 2016 - but the 20-year-old is firing on cylinders now.
Alli's headed double here made it seven goals his last four games, the third time in succession he has scored twice in a game after doing the same at Southampton and Watford.
Pochettino said before the game that he regarded Alli as "the most important player to emerge in English football in recent years".
And here the £5m signing from MK Dons backed up his manager's confident words with a consummate all-round display crowned by the two towering headers which proved decisive.
Alli received a standing ovation when he was replaced in the closing minutes after showing the quality that will make him an integral part of the future of both Spurs and England.
Chelsea still in pole position
Diego Costa and Pedro had a sharp exchange of views in the first half
Chelsea's perfectionist manager Antonio Conte and his players will be bitterly disappointed they could not achieve Premier League history with a 14th successive win that would have matched the mark set across the 2001-02 and 2002-03 seasons by Arsenal.
However they remain in prime position in the title race.
They still have a healthy five-point lead over Liverpool in second place and have come a long way since their last Premier League defeat at Arsenal on 24 September, a 3-0 loss that left them eight points adrift of then-leaders Manchester City in eighth place.
Conte has transformed the mood around the team and the club and while their superb run may be at an end, this is a team fully equipped to go the distance in the title race.
"A massive victory" - manager quotes
Tottenham boss Mauricio Pochettino: "It is a massive victory, a very important three points to reduce the gap at the top of the table. It was a very tough game, we were playing one of the best teams in Europe, so the value of the victory is massive.
"It makes us very proud and we showed character and were competitive. It is one step forward for the team and is important to keep going. Football is about belief.
"We have shown we can challenge for the big things. We are in a good position, Chelsea is in a very good position, but we are fighting to get points and to reduce the gap above us."
Chelsea manager Antonio Conte: "I saw a game with a great balance. It is not easy to play against Tottenham. But we played with a good personality to create the chances to score a goal, but we could not take them.
"It is strange for us to concede these goals because we are defending well, and they are in a crucial moment. At the end of the first half and then in the second half after we miss the chances to score, but this can happen.
"We must work hard and be pleased with our position in the table, but know this league is tough until the end for the Champions League, for the title."
What's next?
Tottenham play Aston Villa in the FA Cup third round on Sunday before resuming their league campaign at home to West Brom on Saturday 14 January.
Chelsea take on Peterborough in the FA Cup on Sunday before travelling to defending Premier League champions Leicester six days later.
Stoke were without a win since 3 December, having conceded four in defeats at Liverpool and Chelsea over the festive period, but Mark Hughes will be encouraged by a convincing home performance.
The Welshman called on the Potters to cut out the "catastrophic errors" that had seen them concede 10 goals in their previous three games, and they looked solid against a Watford side who could only muster two shots on target.
Hughes stuck with the 3-4-3 formation used at Stamford Bridge four days earlier, and with forward Marko Arnautovic back in the side after a three-game ban the Potters were a constant threat.
The Austria international has created more chances for Stoke this season than any of his team-mates bar Xherdan Shaqiri, and his threat in the attacking third saw him make three key passes and deliver seven crosses against a Hornets side struggling to deal with his unpredictability.
However, it was the precise passing of Adam that led to both of Stoke's goals, the Scottish midfielder twice curling in left-footed deliveries that the visitors failed to defend.
Manager quotes
Stoke City manager Mark Hughes: "We have played better and been beaten in recent weeks. We got goals at good times and then saw the game out quite comfortably. We didn't really have to deal with too many moments of anxiety.
"It's good to get a clean sheet, because we have shipped some poor goals in recent weeks."
On the prospect of Peter Crouch being offered a new contract: "Peter has been playing really well and if you put balls in the right areas you know he is going to get on the end of things. I am sure we will get something done - he is playing as well as he ever has done."
Watford head coach Walter Mazzarri: "We played well, but two episodes, two mistakes, and they managed to score goals. We could have scored before them and we didn't do it, but we demonstrated we can play against a difficult team like Stoke.
"We have to keep going and give everything for the next match. Nothing is going our way, so it is just a period we are not lucky but we need to change this. We have many injuries, so it is not a positive period."
What next?
Stoke welcome Wolves in the FA Cup third round on Saturday (15:00 GMT) and then travel to Sunderland in the Premier League the following week.
Watford host Championship side Burton Albion in the cup, before returning to league action at home to Middlesbrough a week on Saturday.
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⚽ Swansea beat Palace in front of watching Clement
Alfie Mawson (right) scored his first goal for Swansea since a £5m transfer from Barnsley in August
Newly appointed Swansea boss Paul Clement watched his side gain a dramatic win against Crystal Palace to move off the bottom of the Premier League table.
Clement was appointed earlier on Tuesday, although first-team coach Alan Curtis had picked the team for the game at Selhurst Park.
Alfie Mawson headed Swansea ahead from Gylfi Sigurdsson's free-kick, before Wilfried Zaha volleyed an equaliser.
But substitute Angel Rangel collected Leroy Fer's pass to net a late winner.
The result means Palace have only picked up one point in the three games since Sam Allardyce replaced Alan Pardew as manager in December.
He will also be delighted with and encouraged by his side's performance in a hard-fought victory.
They dominated the first half with Ki Sung-yueng shooting just wide and Fernando Llorente and Federico Fernandez heading narrowly off target before Mawson put Swansea ahead.
Clement began the game watching from the stands but later joined Curtis in the technical area to help guide Swansea to only their fourth league win of the season.
Another pleasing aspect for Clement will be the defensive performance. Centre-halves Mawson and Fernandez excelled, restricting Palace to only three shots on target.
A spectacular scissor kick from Zaha from 18 yards out looked to have denied Swansea before Rangel's first goal of the season, in the 88th minute, made it a perfect day for Clement.
The result takes Swansea above Hull up to 19th, only one point behind Crystal Palace in 17th.
Worrying times for Crystal Palace
Wilfried Zaha has been involved in 10 Premier League goals in 2016-17 (four goals, six assists), but he will not be available to Palace for at least three weeks as he is on Africa Cup of Nations duty
This was Allardyce's first home game in charge of the Eagles and he will be disappointed with his side's efforts against a team that came into the game with one away win in the league all season.
To make things worse for Allardyce, he will be without Ivorian goalscorer Zaha and Malian second-half substitute Bakary Sako, who will both now go to the Africa Cup of Nations.
Zaha has scored four goals this season, while Sako made an impact as a second-half substitute, forcing Lukasz Fabianski to tip a free-kick over, and causing the Swansea defence problems with his power.
Palace will also be hoping that a shoulder injury to top scorer Christian Benteke is not serious after he landed badly following a clash with Fabianski.
Allardyce was unhappy at two potential penalties that his side were denied - for Fabianski's challenge on Benteke and when Rangel appeared to handle the ball.
What they said
Crystal Palace manager Sam Allardyce: "The lack of energy the players had showed massively. We struggled to keep up with Swansea, we hadn't recovered properly. I should have made more changes but I still don't know the squad too well.
"The second half was ours, we saw a wonder goal from Wilfried Zaha that should have got us at least a point, but we switched off and it's massively disappointing.
"You can see it with your own eyes, you don't need to be a football manager. Some people say it's rubbish but it's not, the players were trying 100% but they were not physically able to reach their usual levels. They are shattered.
"It's beyond our control, certain elements. But we can defend better for the two goals and our first-half performance was nothing like I expect to see from my team."
Swansea first-team coach Alan Curtis: "It is a terrific result for us and a huge three points. The first-half performance, we were excellent and we could have gone in with more than the one goal.
"We have been accused of lacking character but we came back and won it and we deserved it. In training you see the players have the ability, it is just the confidence that has been lacking.
"Any team under Sam Allardyce will come on strongly, they have some terrific players. We had 24 hours more rest compared to them and that may have made a difference."
On the club's new manager Paul Clement, who joined Curtis in the technical area later in the match, he added: "He came down for some moral support, he made his presence felt at half-time, but there was not too much to say. We would have surprised a lot of people with our performance today."
What's next?
Paul Clement will take charge of a Swansea match for the first time when they play an FA Cup third round tie away at fellow Premier League strugglers Hull City on Saturday, 7 January (15:00 GMT). Crystal Palace are also in cup action at the same time, with an away game at League One side Bolton.
Both sides are next in Premier League action at 15:00 GMT on Saturday, 14 January. Palace play at West Ham with Swansea at home to Arsenal.
⚽ From 3-0 down with 20 minutes left to 3-3 Arsenal mount stunning comeback.
Giroud headed the equaliser and was involved in each of Arsenal's three goals against Bournemouth
Arsenal completed a dramatic comeback at Bournemouth as they rescued a point in injury time having fallen 3-0 behind.
The Gunners looked destined for a third away league defeat in a row before a late rally that began with a diving Alexis Sanchez header and gathered momentum when a stunning Lucas Perez left-footed volley reduced the gap to a single goal.
Bournemouth went down to 10 men when Simon Francis was sent off for a challenge on Aaron Ramsey and Arsenal capitalised as Olivier Giroud headed a 92nd-minute equaliser.
The home side had overwhelmed the Gunners early on and taken the lead when Charlie Daniels cut inside Hector Bellerin and stroked a shot past on-rushing keeper Petr Cech.
Callum Wilson scored a penalty to extend Bournemouth's lead and Ryan Fraser sent a shot through Cech's legs for the Cherries' third before the hour mark.
But the hosts buckled under Arsenal's late pressure as Arsene Wenger's side moved eight points behind Premier League leaders Chelsea, who play Tottenham on Wednesday.
Arsenal had produced a feeble display for 70 minutes and were second best in the face of Bournemouth's energy and desire but that all changed when Sanchez headed in at the far post following Giroud's flick-on.
Sanchez has scored 10 goals and assisted three more in 10 Premier League away appearances this season
The momentum of the match changed and five minutes later Giroud clipped a lovely ball to substitute Perez and he sent an angled volley inside the far post.
Francis' sending-off helped Arsenal, although Cherries boss Eddie Howe felt it was a "harsh" decision by referee Michael Oliver.
Perez scores his first league goal for Arsenal
Giroud headed in from a Granit Xhaka cross as Bournemouth failed in their desperate attempts to hang on during six minutes of added time.
Simon Francis was last sent off in January 2015
Giroud has been involved in eight goals in his last four Premier League starts (six goals, two assists)
Mixed emotions for Arsenal
Arsenal have been accused of lacking the character to maintain a title challenge in recent seasons and they did little to change that perception before Sanchez's goal.
They were continually second best to the home side and frustrations rose to the surface in the first half.
Sanchez and Ramsey exchanged angry words at 2-0 down, while Giroud showed his annoyance when Shkodran Mustafi failed to find him with a pass that went harmlessly out of play.
That they regrouped in such thrilling manner was doubtless a relief but not one that entirely satisfied goalscorer Giroud.
"I'm pleased to help the team by scoring the equaliser but I'm still disappointed," said the Frenchman.
"It's nice to come back but the way we played at the end, that made me think we should have done better. At least we came back, showed great mental strength and I will take it."
Narrow miss for Bournemouth
On this date in 2009, boss Eddie Howe was taking caretaker charge of his first match at Bournemouth - who were then second from bottom in League Two.
Success with the Dorset side as they won promotion to League One saw Howe lured away by Burnley, before he returned in October 2012 to complete the club's transformation with two more promotions in three seasons.
It is a mark of the turnaround he has instigated that he and his side were left bitterly disappointed at failing to avenge their defeat at Emirates Stadium in November.
The Cherries' 3-1 defeat at Arsenal was harsh on them and they looked more than capable of making amends for the majority of this game as the Gunners struggled to deal with their attacking 4-4-2 formation.
Even with the Arsenal comeback under way, Howe's men had a chance to go 4-2 up when Dan Gosling turned superbly in the visitors' area only to shoot well wide of Cech's goal.
A point keeps the Cherries ninth in the table.
What they said:
Arsenal manager Arsene Wenger: "At the start we suffered from the quality of Bournemouth. One team had over three days to recover and on top of that we suffered at the back.
"It was a physical test but we came back into the game and we showed we are mentally strong. I am happy to play every day but only if our opponent has done the same."
Bournemouth boss Eddie Howe: "It's a strange one for us. At 3-0 up you hope the game is over but you can't underestimate the quality of Arsenal and as soon as they got the first goal the game changed.
"We didn't see the game out in an effective manner from our perspective but you have to praise their resilience."
What next?
It's FA Cup third-round action for both these teams in their next outings with Bournemouth at Millwall at 15:00 GMT on Saturday, 7 January and Arsenal at Preston for a 17:30 kick-off on the same day.
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⚽ Man Utd beat West Ham after controversial sending off
Juan Mata celebrating his goal minutes after coming as a substitute
Manchester United moved level on points with fifth-placed Tottenham after victory at West Ham, who played for 75 minutes with 10 men following the controversial dismissal of Sofiane Feghouli.
Referee Mike Dean showed Feghouli a straight red card after the midfielder's 15th-minute challenge on Phil Jones.
Replays showed it was more of a coming together between two players committed to winning the ball than a reckless challenge meant to cause harm.
Antonio Valencia was guilty of an astonishing miss for the visitors before substitute Juan Mata scored from 10 yards after Marcus Rashford's clever pass.
Zlatan Ibrahimovic was one of three players offside when he doubled the lead after Pedro Obiang's clearance fell to Ander Herrera.
It was Jose Mourinho's side's sixth straight Premier League win and their seventh in all competitions.
Match Highlight
Dean at the centre of controversy - again
The Hammers have beaten Bournemouth, Sunderland, Burnley and Hull at home this season, yet their hopes of claiming a first major scalp at London Stadium were undone by the fastest sending off in the Premier League this season.
Manchester United have won their past seven league and cup games
There is no doubt Feghouli lost control of the ball and deserved a booking for his challenge on Jones.
But Dean, who sent off Southampton's Nathan Redmond in the 4-1 defeat by Tottenham on Wednesday, brandished a red card for the fifth time this season, much to the fury of West Ham boss Slaven Bilic.
Jones, who was clearly hurt and rolled over several times before receiving treatment, was booed by home fans for the rest of the game each time he touched the ball.
Feghouli is now set to miss his side's FA Cup third-round home tie against Manchester City on Friday, while Hammers supporters showed their anger at the official by chanting 'Mike Dean - it's all about you'.
In the second half, Dean kept his cards in his pocket after Cheikhou Kouyate's reckless challenge on Henrikh Mkhitaryan.
