That picture of Wesley's knee looks awful, but he didn't seem to be in as much pain as you would expect from that. It certainly didn't seem to be as bad a tackle as Targett's against Leicester.
While it isn't Wes's fault in any way, he did go into it very half-heartedly, they say that you get hurt worse when not fully committed to the tackle.
Today was one of his better performances, let's hope it isn't as bad as it looks.