There is a full back out there in one of the other 19 sides and he is sat in bed, and he doesn't know this, but one day, maybe real soon, he is going to have to defend against Toure and Amavi. Ouch.
I suppose the best thing to do against Palace is to give him 20mins in the second half to give him an idea of the pace of the EPL. At 19 he should be able to manage that.
For Palace I'd goDefenceVeretout Gueye WestwoodTraore SinclairGestedeAyew on as a sub depending on the situation.