The 26 year old joined United as a 17 year old and made 23 appearances before heading back to Spain in 2008, an improved player and person by his own account. In his time at the club he picked up a Premier League medal as well as a European Cup medal, since adding 2 more to this with Barcelona.
Whilst he has fond memories of his time under Sir Alex, the defender jokingly reminds his old manager whenever he gets the chance that he got it wrong with him as he told Guillem Balague in The Daily Telegraph:
“The kid who went to Manchester was a boy of 17 who found himself in a changing room full of stars and had a wonderful time. I remember when I was called to train with the first team, it was wonderful.
“That prepared me for what was coming, for the return to Barcelona. Without that pressure, I would have been a bit green when I came here.
“I am very proud of my three years there, of having decided to go to Manchester first – at 17 it was the perfect time for me to leave home because it helped make me as a person.
“I am proud to have been part of a Sir Alex Ferguson team. Even though every time I meet him I tell him that he got it wrong with me!”