City manager Roberto Mancini, who worked with the 20-year-old when he was in charge at San Siro, expressed his delight at the summer deal.

"I think that Mario is one of the best players of his age in Europe, and I very happy to be working with him again," Mancini said.

"His style of play will suit the Premier League, and because he is still so young there is a big chance for him to improve.

"He is a strong and exciting player, and City fans will enjoy watching him."

The Palermo-born frontman will not be available for City's season opener at Tottenham Hotpsut on Saturday.