They're not exactly thick on the ground though - I'd back the manager to develop one of the young centre halfs we have. Someone like Sokratis isn't really a step up on Mustafi. Wouldn't mind the young Turkish lad from Freiburg and a more experienced campaigner (Jonny Evans? )
From what I’ve read of him he should be more than capable of reviving the likes of Xhaka, Ramsey and Bellerin.
Not so sure about Mustafi...that project might be one to file away in the Too Difficult draw