I'd hold on to him myself for a season or two to see how things go. He could morph into a similar player like Matip like not blessed with the pace but has the intelligence to make up for it. That and the lad is a beast in the air.
I think he has done enough to spark interest off a few premier league clubs this summer though. He will attract bids and I think we will cash in because it's easier than offloading one of the duds.
Coady was let out of here too early imo. He was never truly suited to RB and was always a CH but we never used him there. Now he has experience he has turned into a good CH and wouldnt look out of place alongside Virgil.