Just look at Frank Lampard.
Players who have a point to prove and a need to show just what they think they can do are always a bit of a risk but usually one that pays off.
Fellaini is desperate to show that the player from Everton still exists and there have been flashes of that.
He will work twice as hard as some of his teammates in order to prove this – and it will not go unnoticed by his manager.