Have posted the same comment a million times and am bored of doing it but he's just not right for this system. In a flat back four he'd be brilliant. It's the exact issue we had with Van Aanholt, a natural wingback, but didn't suit the back four we had at the time.
I know we lost yesterday but I thought, even excluding the errors from Mitchell, the threat we posed once Chilwell and Eze were on that side versus Mitchell and Devenny in the first half was like night and day.
Personally I wouldn't mind trying Mitchell on the left of the back three given how good he is defensively, with him moving over to cover for Chilwell when he goes forward.
If Glasner is staying long term and we're keeping on with this system, it probably makes sense to cash in on him this summer (assuming he did sign the reported contract extension before) and buy a specialist in the position.