Norwich City are chasing the defender.
"I haven't been told by the board that Curtis has to go. Curtis hasn't made a point to me he wants to go," said Clark. "I have had a face-to-face meeting with Curtis, he was very positive in the meeting, he has been very receptive to the training.
"As I have said all along, we are going to get rumours because there are good players here. I haven't got a problem with that. All I can say is I haven't been told by the board that, if a bid comes in, we have to accept it."