To be fair the injury must be really playing on his mind, my brother had the same thing happen (looked down and his foot was facing the other direction) and was a half decent player. Can't play anymore as everytime he went into a tackle just had flashbacks and pulled out, of the tackle that is.... Still doesn't sound great
I really sympathise with him in this respect so I think the best course of action would be to sit him out for at least two months minimum, keep him busting his arse in training and try and get his head right!
If your head ain't in it, it doesn't matter what the body can do or what skills you possess!