I've not seen the lad play so I really don't know how good or bad he is but surely Ashley Phillips could be considered in the starting eleven tomorrow? He is a 'proper' centre back after all and is surely more mobile that Dier. He has the height and energy and he's trained in Ange's system. I get he's young, but in the circumstances does that matter? I suppose if Ange thinks he's up to it then he will start - otherwise I think he'll play Dier for his height and CB experience.