Manchester United have completed the signing of Juan Mata from Chelsea for a club-record fee.
The Spain international moves to Old Trafford for a fee of £37.1million, ending his two-and-a-half-year stay at Stamford Bridge.
Mata, Chelsea's player of the year for the past two seasons, had joined the club from Valencia in June 2011 and made 135 appearances.
He had fallen out of favour since the return of Jose Mourinho as manager at the start of the season, making just 11 Premier League starts this term.
He told the club's official website: "I am thrilled to be joining United. I have enjoyed some very happy years at Chelsea but the time has come for a new challenge.
"United is the perfect place for me and I am excited at the chance I have to be part of the next phase in the club's history.
"Chelsea is a top club and I have many friends there but you cannot turn down the chance to join Manchester United. I look forward to helping the manager and the team be successful in the coming years."
The move represents the big-money transfer that Manchester United fans have craved ever since new boss David Moyes took over from Alex Ferguson ahead of the start of the 2013-14 campaign.
Exits from both the FA Cup and the League Cup in the last month have heaped pressure on Moyes, who has also seen his side slip to seventh in the Premier League.
The Scot, though, believes he has signed a player of real quality.
"Juan is one of the finest playmakers in the game today and it's a real pleasure to have secured his signature," he said.
"He's been instrumental in Chelsea's recent success, with a notable 28 assists and 32 goals in his last two Premier League seasons.
"I have been impressed with the excitement he has shown to be part of the new Manchester United. I know our fans have admired Juan for some time now – he has always played well against us – and I know they will be delighted to see him in the red of United, starting on Tuesday."
Mourinho admitted that the move was a good one for all parties.
"I and everyone at Chelsea have massive respect for Juan and his big talent, and when he told us of his wish to move on because he wanted to play more, we did not want to deny him this opportunity," he told Chelsea's official website.
"We want him to be successful in his career and as well as that, this transfer makes huge financial sense to us at Chelsea.
"We are pleased Juan will stay in England - even with a rival club. He is happy in this country and it is good the Premier League retains such a talented player.
"Juan moves with our full blessing and I can speak on behalf of everyone at the club in thanking him for his fantastic service, and wishing him well for his future."
United sit 14 points behind Premier League leaders Arsenal, with Mata in line to make his debut when they face Cardiff City in the Premier League on Tuesday.
|´I don´t care about age´ - Klopp committed to promoting youngsters|
|Koeman: Ibrahimovic was fantastic at 19|
|Pulis not letting court decision tarnish Palace memories|
|Carroll to make West Ham return against Arsenal|
|Real Madrid must win LaLiga and end Barca dominance - Roberto Carlos|
|Barcelona v Real Madrid: Zidane´s men eye LaLiga supremacy|
|Costa discipline issues in the past - Conte|
|A-League review: Melbourne Victory held by Perth Glory|
|I deserve criticism if Dortmund´s players do - Tuchel|
|Emery wants Cavani to dethrone Ibrahimovic|
|Martial is happy again, says Mourinho|
|Guardiola wary of Costa and Pedro|
|Messi, Ronaldo and Griezmann to battle it out for FIFA award|
|Conte reveals admiration for Guardiola philosophy|
|Mourinho: Schweinsteiger can stay at Man Utd|
|Conte: It is a pity Chelsea sold De Bruyne|
|Carrasco now competing with Griezmann and Gameiro - Simeone|
|Luis Enrique: Clasico not decisive in title race|
|Barcelona have no weaknesses - Zidane|
|Zidane: Ronaldo´s hunger for success key for Real Madrid|
|Barcelona midfielder Iniesta back for Clasico|
|Higuain does not need Dybala to score - Allegri|
|Summerbee: Chelsea blew it with De Bruyne|
|Ranieri, Zidane and Santos up for FIFA coach award|
|Chelsea paid me £50,000 to prevent child abuse revelations - Johnson|
|Vertonghen signs new Tottenham deal|
|Klopp hopeful on Lallana and Firmino|
|Ozil: Arsenal can win Champions League with a bit of luck|
|Sturridge exit a non-story, says Klopp|
|Debuchy out for up to six weeks|
|Pardew ready to turn around slumping Palace|
|Arsenal will not sign Cazorla replacement - Wenger|
|Courtois not getting carried away over Chelsea form|
|CAS to rule on Blatter case on Monday|
|Ozil refuses to rule out Real Madrid return|
|Sterling: I am keeping away from certain stuff I was doing last year|
|Leverkusen´s Volland out until 2017|
|Aloisi rules out Roar swoop for Keane|
|Pele reflects on ´sad moment´ of Chapecoense tragedy|
|Southgate urges downtime responsibility from England|
|Ranieri: Leicester signings not to blame for poor form|
|Sky is the limit for ´special´ Donnarumma, says Hart|
|Southgate drops Rashford Euro U21s hint|
|Chapecoense will rebuild with the world´s support, says vice-president|
|Toure can win Premier League for Manchester City - Hart|
|Only a matter of time until Balotelli gets Italy call - Zola|
|Ter Stegen can become new Valdes at Barca - Zambrotta|
|´Exceptional´ Costa just like Drogba, says Zola|
|Ronaldinho could play for Chapecoense|
|Garcia extends Manchester City deal|
|Injured Cazorla to miss another three months|
|Schmeichel has a gentle handshake, not like Wasilewski! - Ranieri|
|Lloris to follow Kane and pen new Spurs deal|
|Puel: I replaced Koeman to give Southampton youngsters a chance|
|Barcelona could have signed Ronaldo for €17million before Real Madrid move|
|Ancelotti keen for Lahm to carry on playing|
|Leipzig will last the pace in title race, says Ancelotti|
|If Bayern lose I´ll cry and miss El Clasico! - Ancelotti|
|No Europe could give Conte edge over Guardiola - Summerbee|
|Southgate keeps Rooney as captain but calls for leaders to emerge|
|Real Madrid dominate FIFA FIFPro World11 nominations|
|Sigurdsson: Kane will be Spurs´ main man for years to come|
|Ronaldo can beat Messi to next two Ballons d´Or - even if he loses the Clasico|
|No break clause in Southgate´s England contract|
|Kane signs new contract with Tottenham|
|Phelan hopeful on Hernandez and Maloney for Boro trip|
|Pioli not entertaining Messi to Inter possibility|
|Conte doing a remarkable job at Chelsea - Zola|
|Nesta amazed by ´special´ Totti|
|Elneny sick in Saints loss - Wenger|
|Atletico Nacional supporters pay tribute to Chapecoense air crash victims|
|Enzo Zidane targets more opportunities after ´special´ debut goal|
|Mkhitaryan excited by United display|
|Toronto FC 5 Montreal Impact 2 (aet, 7-5 agg): Hosts storm to maiden MLS Cup berth|
|Emotional Cavani brings up 100 amid Chapecoense tributes|
|Barca did not take Hercules lightly, insists Luis Enrique|
|Emery feels PSG are slowly making progress|
|Barcelona do not need to be scared, insists Rafinha|
|Simeone wants consistency from Gaitan|
|Wenger blasts sloppy Arsenal after Southampton loss|
|Hercules 1 Barcelona 1: Debutant Alena prevents embarrassing defeat|
|Mourinho: Half-time pep talk was catalyst for United win|
|Cavani hits 100-goal mark for PSG|
|In El Clasico there are no favourites - Deco|
|Manchester United and Liverpool kept apart in EFL Cup draw|
|Chapecoense asked to continue in Brasileiro to honour plane crash dead|
|Paris Saint-Germain 2 Angers 0: Cavani nets landmark goal in routine win|
|Guijuelo 0 Atletico Madrid 6: Carrasco scores twice in rout|
|Manchester United 4 West Ham 1: Mourinho ban no problem for dominant hosts|
|Arsenal 0 Southampton 2: Gunners lose first game in 20 as Saints march on|
|Zidane ´proud as a father and manager´ for son Enzo|
|Cuca to leave champions Palmeiras|
|Real Madrid 6 Cultural Leonesa 1 (13-2 agg): Zidane´s son nets on debut in Copa cruise ahead of Clas|
|Mascherano: Messi is three players in one|
|Speaking to Arsenal players did not feel right - Wilshere|
|Saint-Etienne don jerseys with Chapecoense badge|
|Watzke backs Tuchel over Dortmund criticism|
|Southgate sees Lallana as crucial to tactical plans|
|Ribery: Bayern must hold on to Robben|
|Beckham: I believe in Mourinho|
|Mourinho to serve one-match touchline ban|
|Messi, Suarez and Neymar world´s best - Coutinho|
|Khedira: Time for Juventus to step up|
|Southgate confirmed as England manager|
|´Our fans would never forgive us´ - Bayern won´t sell Muller to Manchester United|
|Alonso open to new Bayern Munich contract|
|Poulsen: Don´t compare Leipzig to Leicester|
|Mathieu out of Clasico with calf injury|
|West Ham´s Sakho out for six weeks|
|Hoeness warns ´outstanding´ Lahm against early retirement|
|Kompany determined to end injury heartache - Summerbee|
|Inter dreaming of signing Messi|
|Zidane and Luis Enrique tangled in El Clasico´s identity politics|
|Bilic: Mourinho kicked the bottle too well!|
|Alonso: I wish we had Ronaldo at Bayern|
|Beckham´s franchise would be welcome in MLS - Nesta|
|Emery confirms Barca approach for Marquinhos|
|Tite, Zidane pay respects to crash victims|
|Chapecoense pay tribute to ´eternal champions´|
|Amor banned for Phoenix clash|
|Benitez laments missed opportunities|
|Colombian plane crash toll revised to 71|
|Klopp tries not to spark Woodburn blaze|
|Wenger to field ´mixed´ side against Southampton|
|Lucas: It was hard to play after Chapecoense tragedy|