For the depth?
We already have Zebina, Birindelli, Salihamidzic, Grygera, Criscito, Boumsong, Legrottagli, Chiellini, Molinaro and probably Milito, that are 10 players for maximum 4 spots.
If you want Barzagli added to that list, I am sure one or two will have to go.