I think for Potter champions league is the last chance to prove himself otherwise he can get fired just after losing the game against Real Madrid, that's why I expect to see Chelsea playing with full power against Real Madrid but on the other hand, since for Real Madrid champions league is the first priority I don't think if Ancelotti will let Chelsea win this game easily.
A champions league knockout will be the last straw the breaks the camel's back. The Chelsea's board has been really patient with him, they have been busy in the transfer window bringing in new faces to Stanford bridge and they have given him enough time to make the team work. I have said it before that Chelsea has assembled a young talented team that can win trophies but want they really need is a good manager. Potter is not the man for the job and I'm still surprised he hasn't been axed.