He said: "Milan is my home. I did not want to interrupt my career with the Rossoneri after winning my first two trophies with this shirt.
"I want to contribute to the writing of Milan's history and to the future success of this club, in perfect harmony with everything.
"This joy gives me the energy to face future matches with more enthusiasm, with the desire to win and to score goals.
"Today is a special day for me. I thank the Prime Minister Berlusconi, the club and the fans who have always believed in me."