Chivu should play in the center of the defense so that Juan is confronted to Niang, who, if opposed to Nagatomo will completely rape us.
Gargano and Cambiasso next to Kovacic to relieve him from defensive duties, Guarin should be pressing Montolivo to prevent him from distributing play for Milan. If he succeeds in doing this, he could be deadly, like against Juve, picking up the ball from Milans midfielders and projecting himself in attack with that incredible pace and strength of his.
Palacio should try to run in spaces behind Mexes and Zapata, they are very bad at preventing opposite attackers from sneaking behind them, which is Rodrigo's strength.
I really think that this formation could work pretty well.