Luque is probably on about £45,000 a week. No other club will pay him that and he has already turned down moves that offered him less - so he's staying and its a no brainer really - try and get something out of him on the pitch. Don't know how much of what has happened to Luque so far has been down to Roeder's poor man management and how much is down to the player's attitude to be honest.
I wouldn't question Sam's ability to man manage so its up to Luque to prove himself now.