It's also worth remembering that even if the big stars were to play, it's tough to predict what kind of attitude they would have.
I mean, the likes of Rooney, Ronaldo, Vidic etc know they will play in Rome.
But they know they will only play if fit.
So it would be understandable for them to not give 100% @ the risk of missing the game.
But players like Macheda have nothing to lose.
In fact they have everything to gain by impressing.