If Lambert doesn't like him, or can't fit him into his system, then I think it's in both parties best interests for him to find somewhere else to be honest. I am a fan of his, but if we aren't gonna sign any outright wingers and stick with this narrow system then he's just an expensive passenger.
If we still had Young and Downing, it would be different. But since we don't and with Lambert seemingly not a fan of direct wingers, I think the money we get could buy us some more strength in depth, which we badly need.
Sign a more technical player to go up top playing off Benteke/Gabby, and we won't miss his presence too much I don't think.
Obviously if we do have the money to spend on some quality service for him, then it's a no brainer to keep him. But if we're sell to buy in Jan, he could certainly be sacrificed..