Is it definitely the jaw or the cheekbone?
A hairline depressed fracture of the cheekbone isn't too much at all and he should be right to play. Normally no plate, but they stick a spoon thingy up their and pop the depression out like a panel beater.
I've had a few* because I am such a rude, obnoxious bastard.
Apparently.
*2
1 footy, 1 cricket.
Never