The former Juventus striker has joined the Rossonero as a free agent.
He told TMW: "There remains a doubt about how he was managed at Juventus, given that someone like him would have been useful anywhere.
"A smart and low-cost acquisition by AC Milan, the only unknown is his physical form because he hasn't played for 10 months. They tell me he's very fit, but doing it with a coach is different than having the pace of the match.
"He doesn't get on the ball immediately, but on character and technique, he's super for what he can give to the locker room even with a certain thirst for revenge to prove that Juve was wrong."