On 13 April 2010, Cagliari surprisingly removed Allegri from his managerial duties despite a solid 12th place with 40 points, and youth coach Giorgio Melis — with Gianluca Festa as his assistant — was appointed at his replacement.
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He led Milan to their sixth Supercoppa Italiana by coming from behind in a 2–1 win over city rivals Internazionale in a game played at the Beijing National Stadium.