Imagine the excuses if they lose to City, "they had 24 more hours to recover" etc.
I don't think this will get moved, the Premier League will have planned for every eventuality with regards to the CL draw amd would have announced any fixture change pretty quickly. The fact that both the CL and Premier League games are fairly local and they've over 50 hours after our game to recover will be deemed ample time I would think.
Edit. Shut up!