We have multiple options. The biggest problem for us is that Prince (our #10) is not nearly as creative as we need. But, we have Plenty of Defensive Midfielders. We could switch to the 4-2-3-1, or stay with our current setup.
Option A:
When Muntari comes back, we can confidently play the 4-2-3-1, with runners on the wings (Prince&Binho) and Monty as the creative force, with 2 destroyers behind him, and a poacher in the penalty box:
Option B:
Other option is to move to a Christmas Tree formation, with two hard working forwards in support of Pato/Pazzini, moving Prince to midfield:
Option C:
Our current formation:
Option D:
Not an option, but if Allegri wanted to change the system completely, I believe we now have the players to do it, playing a 3-4-3 or 3-5-2:
Obviously Ambrosini or Muntari can play in middle.