I'm not shocked. When he played for England last season he looked slow to me. As far as I can see he's basically a similar player to Shane Duffy. If we look at the summer signings, every big money one has basically got no pace. You just can't get away with that in the Premier League.
If we are going to play some decent football we need to press and have a high line. To do that effectively we need pace at the back. We haven't got it.
In the short run we are in a very poor place with this current defence. We need a couple of centre halves and a left back - sharpish!
The whole defence is shockingly bad, I just can't see what Koeman and Walsh were trying to build, it's just a mish mash of piss poor players.