We need him badly, we have absolutely no one of real match winning quality in that position and we’ve needed it for 4 years. Probably more.
Problem is with Ozil, you'll either get the player who played against Spurs, or the Ozil who's been underwhelming when his team has needed him for a while now. The only thing I can think of is, probably his best ever form came under Jose and he's already spoken about how his tough love worked great for him.