Watching the injury back on the highlights he seems to feel it before the awkward landing. Could be completely wrong but I didn't see anything to suggest it was serious before he went down awkwardly. I'm hopeful this is actually just a slight strain that felt worse because of the awkward landing.
If it is a bad injury though, do we go out an replace him in the last few days of the window. If both him and Nasri are missing until at least the last month of the season i think we have to. Silva Sterling and Navas isn't enough and Yaya can't play number 10.