The Albion striker attempted to push through a move to QPR without gaining permission from his club.
Lambert said: "t's ridiculous. I don't know why he did it. I don't know what's happened there.
"But the dressing-room will sort that out when he gets back.
"I'm pretty sure that if they've got anything about them - and I'm sure they have - that the rest of the players will be sorting that out. "