It's much more likely to be like this:
Buffon
Grygera- Legro - Chiellini
Caceres - Melo - Marchisio - PDC/Gio.
Amauri - Del Piero
Makes no sense to call the subs beforhand.
However, hes has been talking about the defense, I could actually see him abandoning the 3 man defense. Well...