The Spanish centre-back made his way through the Blaugrana's famed academy as a youth player but signed his first professional contract with the Red Devils in 2004, only to return to his childhood club four years later.
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"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!" the defender told The 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 [remains]. 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."