"After feeling strange in the second half of the Burton game in September, I underwent a series of tests," he said.
Former Manchester United manager Alex Ferguson once said he would not sell Real Madrid "a virus" let alone Cristiano Ronaldo but, as even he found out, when the Spanish giants come knocking they usually get what they want.
News of all that's transpired on and off the football field
Juventus clinched a place in the Champions League knockout stages when a brilliant Cristiano Ronaldo assist set up Mario Mandzukic to give them a 1-0 win over Valencia on Tuesday.
Images from the EPL matches played on Saturday
Lionel Messi passed up the chance to net his 300th La Liga goal and instead put a hat-trick on a plate for team mate Luis Suarez with an outrageous penalty routine.
While Lyon rallied to hold Leipzig 2-2 after a Memphis Depay strike, it was the English clubs who made a mark on the night. Liverpool and Chelsea moved into the last 16 with contrasting wins and now all four English clubs, including Manchester City and Tottenham Hotspur, are in the Champions League knockouts this season.
Arsenal manager Arsene Wenger has said he was unsure whether there were divisions in the club's boardroom regarding his future and that he was more focused on salvaging his team's stuttering Premier League campaign.
Atletico Madrid got their La Liga campaign up and running in less than convincing fashion when Antoine Griezmann's deflected free kick secured an edgy 1-0 win at home to promoted Las Palmas on Saturday.
Images from Tuesday night's UEFA Champions League group stage matches.
Martin Jol's two-year spell as Fulham manager ended on Sunday after the Dutchman proved unable to reverse the club's sinking fortunes.
Lionel Messi will be working "full time" to shake off the hamstring injury sustained on Sunday that will sideline him for six to eight weeks, Barcelona's Argentine World Player of the Year said on Tuesday.
Manager Arsene Wenger has silenced his critics with Arsenal's rip-roaring start to the season, club great Dennis Bergkamp said on Friday.
A summary of sports events and sports persons, who made news on Tuesday
News of all that's transpired on and off the football field
Factbox on Barcelona and Argentina forward Lionel Messi, who became his country's all-time top goalscorer on Tuesday when he scored his 55th international goal.
Juan Mata hailed George Best "a genius forever" as an injury-hit Manchester United aim to mark the 10th anniversary of the Northern Irishman's death with a Champions League victory against PSV Eindhoven on Wednesday.
Coach Brendan Rodgers has stated that Liverpool are in complete control of the situation regarding Luiz Suarez and it is up to the club to decide if the volatile Uruguayan striker will be sold.
Champions League holders Real Madrid will face former European champions Liverpool, FC Basel and debutants Ludogorets of Bulgaria following the group stage draw on Thursday.
News of all that's transpired on and off the football field
Paul Pogba repaid some of his world record transfer fee with two goals as Manchester United rediscovered their early-season shine, cruising to a 4-1 Europa League win over Fenerbahce to go top of their group on Thursday. Pogba scored a penalty and rifled United's third into the top corner. Anthony Martial also netted from the spot and Jesse Lingard fired home in the second half before former Old Trafford favourite Robin van Persie pulled one back for Fenerbahce. Inter Milan and AS Roma, though, had more testing evenings. Coach Frank de Boer breathed a sigh of relief when Inter survived an onslaught from Southampton to end a three-match losing streak with a 1-0 victory while Roma conceded twice late on to draw 3-3 at home to Austria Vienna.
News of all that's transpired on and off the football field.
Manchester United's Zlatan Ibrahimovic proved his hunger for silverware has not diminished with age as the Swede's double earned a 3-2 win over Southampton in an absorbing League Cup final at Wembley.
News of all that's transpired on and off the football field
Barcelona coach Luis Enrique led tributes to the late Johan Cruyff in a memorial organised by the club on Tuesday and vowed to "continue copying and improving his style of attacking football".
News of all that's transpired on and off the football field
News of all that's transpired on and off the football field
Paris St Germain are sweating over striker Zlatan Ibrahimovic's fitness as the French champions look fragile ahead of Barcelona's visit in Champions League Group F on Tuesday.
Lionel Messi fittingly sealed Barcelona's 26th La Liga title on Saturday by coming off the bench to score the goal in a 1-0 win over Levante in front of a jubilant Nou Camp crowd, who celebrated a remarkable eighth league crown in 11 years.
Louis Van Gaal said it would take him three years to transform Manchester United into a potential title-winning team when he became manager last summer, but judged by Sunday's loss to Southampton, he might have to wait a lot longer than that.
Hegerberg hat-trick fires Lyon to fourth straight Champions League
Images from the EPL match played between Manchester United and Southampton on Monday.
AC Milan youth players subjected to alleged racist abuse; Argentine fan punches player.
Barcelona extended their near-perfect start to the season when Alexis Sanchez tapped in at the far post from Neymar's clever assist to secure a 1-0 win at home to city rivals Espanyol in La Liga on Friday.
Barcelona forward Lionel Messi equalled the Champions League scoring record of 71 goals when he struck for the second time in the 76th minute of Wednesday's Group F match at Ajax Amsterdam.
News of all that's transpired on and off the football field.
Lionel Messi set a new Champions League scoring record with a hat-trick and Luis Suarez netted his first in Barcelona colours as the Spaniards comprehensively beat APOEL Nicosia 4-0 in the Champions League on Tuesday.
Manchester City claimed the win required to finally end Liverpool's relentless attempt to dethrone them as Premier League champions as they hit back from a goal down to crush Brighton and Hove Albion on the south coast on Sunday.
A factbox on Barcelona and Argentina forward Lionel Messi
Biting opponents may be appalling but it is harmless and should not be punished as severely as a bad tackle, says controversial Barcelona striker Luis Suarez.