I'd start with this formation: Buffon, Lichsteiner, Barzagli, Bonucci, Caceres, Peluso (Asamoah if fit and ready), Marchisio,Vidal,Pirlo, Vucinic and Matri.
Peluso and Caceres give us more solidity and physicality, not to mention that Caceres can be a danger for us on set pieces, and aid in curbing the threat from Celtic on set pieces as well.