Mustafi is already good enough to easily be our second best CB behind Kos. He is also 24 years old, but already with a lot of top level experience. For me, this is exactly the type of profile we need right now; a player ready to go right into our first XI, and also with potential to develop further. If the alternative is another gamble on a player to 'step up', then I fail to see the point of such a signing. May as well give that playing time to Chambers and Holding, because they seem equally likely to be able to step up.
