Pato sat out the 2-2 draw with Napoli on Saturday.
Allegri said: "Pato is a player who is important on a European level. This could be his game. Kevin-Prince Boateng had a good performance in terms of intensity and technique on Saturday, which was a good sign for him and for us.
"Robinho provided a stunning pass for the equaliser that only champions know how to do. I still have to decide who starts and what support I can expect from the bench."