"That's why I said eight weeks ago we should tie him up. If we don't, and we lose him, then what can I say?
"It shouldn't happen and it probably won't happen. But it could. He's not knocking the door down saying what's happening and I'm not pushing things either.
"I said what I said and I think Michael knows how I feel. In a playing sense, he's been asked different questions and the answers he's coming up with are world class.
"In the position he's playing in for us, nobody in the world could do a better job. He's linking us up and scoring goals.
"Instead of having one player up front we've got two. It's like we're playing with 12 men sometimes."