He admitted he gave up on his United career after being snubbed for the new year's eve clash with Blackburn Rovers in 2011.
"I said to (Sir Alex) Ferguson: 'Play me, and I will show you if I'm ready or not'," the French international told Telefoot.
"Against Blackburn, on December 31, 2011, I was on the bench. Ferguson puts Rafael in midfield with Ji Sung Park. Then I gave up. I was really bummed.
"I joined Juve to silence people who have criticised me, who did not believe in me and said that I would fail."
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