Losing weight and core fitness are entirely different things.For whatever reason he hasn't trained or played properly for a long time.Given an extended run in the side and a proper training regime suited to his situation will eventually see him last the 90.This is what the gaffer was on about when he said "its up to him".As someone else said I'd have him for an hour any day at the moment but to use a boxing parlance if he smashes it too much in training he runs the risk of "leaving it all in the gym" on matchday.