We have four central defenders , two young and not ready for a full season yet, one unproved in the premiership and the other injury prone and hit and miss - i have great hopes for okore but not convinced the other 3 are good enough - Vlaar and okore may work well but Vlaar with baker or Clark doesn't fill me with confidence - maybe we do need a utility defender who can cover central defence.
Shawcross would fit the bill for me , Clark is a defensive midfielder at best - as a centre half , he is not good enough.