As far as I see it, Buffon, Bonucci, Chiellini, Marchisio, Aquilani, Quagliarella and Iaquinta should compete for a place in the starting 11 if they're fit. Only Buffon and Chiellini are certain.
In addition to those, Motta, Lanzafame, Pepe and Del Piero could play their way into the squad...