The way I see it in regards to this match, is take a look at the 4 subs who are on the pitch right now. With the exception of Ogbonna, who wouldn't even be starting this match if Barzagli were ready, the other three (Pereyra, Llorente, Padoin), are normally the first three players to be called upon by Allegri for a match off the bench, so in a way it makes sense to give those three some serious minutes today in case they need to come in next week.