كتب : Amro Hassan
Brazilian playmaker Kaka scored the Rossoneri's only goal of the game courtesy of a 15th minute penalty kick.
The win lifts Carlo Ancelotti's men to second place in the table with 26 points from 12 games.
Relegation battlers Chievo remain rooted to the bottom of the league, with just six points.
In the same round, Udinese were stunned by Reggina, who beat the Zebras 1-0 at the Friuli. Federico Brienza scored the winner for the hosts on 79th minute.
Sampdoria also beat Lecce 3-2, and Catania secured a hard fought win over Torino with the same result.