Thbe other thing is if he played Kompany and his mental state was not right and hesitated in trying to go for balls that may cause an injury, it is a minefield unless he is 100%.
Demichelis is not match fit and that's his problem, and Skoorb is right, Sagna is the better option, but we all know that MP will stick with Demichelis if he does not have Otamendi and wont risk Kompany.