Cesc has been saying on Twitter that he is doing his best to make it for Monday. It is not as if we are rushing him back early, he is currently on schedule but my issue would be his match fitness rather than a reoccurrence of his hammy. If he isn't ready then he will not be risked.
I would start the Tomas Rosicky of Aston Villa and keep Cesc on the bench but then again I wouldn't start the Rosicky of Fulham where he was woeful. It is difficult to tell which players will turn up and which