Answered it umpteen times already: he's got ability going forward but he's been bought as a defender and clearly shows no aptitude for it....something I've commented on after seeing him play and a weakness obviously picked up on in training by Lampard and Clement. We have a lot of players who are attack minded and who have a cross in them, so that's why he isn't a consideration as a wing back.
If he wants to be a "good buy" he'll have to add defending to his game. As said already, that means for me a loan spell in the Championship.
Of course, you wont want hear all that.