The 22-year-old signed for the San Siro side in a deal worth around €21m from Manchester City.
“It is a real honour to be here,” he told a Press conference. “I have always wanted to play for Milan.
“I want to be an important player for this club. Being here really is a dream – however, I'd rather let me football do the talking.
“I would have liked to have joined earlier, but I am here now.
“I also want to thank the City fans – they always supported me, no matter what. I will always remember training with my teammates there, and the matches.
“The rest though, I will not miss. The Premier League is a great League, but I am only thinking of this adventure.
“The President has apologized for calling me a rotten apple,” he added. “But I did not hear anything anyway. I have never voted in any election, and I'm not ashamed of that.
“Anyway, it's a dream to play here. I've wanted this for a long time, and now I just want to play.”