I think it is a bit unrealistic to expect him to get his debut in such a tense game.
The game was very tight and Allegri went with his tried and tested, I see no problem in that. If we were 3-1 up I could maybe see why he should be given a go.
With Pirlo injuried, Marchisio will most certainly play in the center. So does that mean Vidal stays at AM or dropping back next to Marchisio? If he stays at AM then that should mean Sturaro gets some playing time?