Juventus coach Gigi del Neri expects Zlatan Ibrahimovic to have a say on the title race.
The former Barcelona striker signed with AC Milan yesterday.
Del Neri said: "It wasn't easy to build this side. It was also important that the club time it correctly to balance the books.
"Inter are still the team to beat and have more experience as a unit, but many teams are strengthening to do well.
"Can Zlatan Ibrahimovic transform Milan? He is a big name, but a player only makes the difference if he is part of a situation that helps and motivates him."
