"We remain hopeful that we can sign Harry to a new deal but it does depend on whether he is hell-bent on playing in the Champions League next season," he told the Yorkshire Post.
"I hope he will stay and Peter Reid wants him to stay, but if we are not successful in persuading him to sign a new deal then we are not going to sell him for silly money.
"Even if he wants to leave, it has to be a deal that is right for the club and which mirrors our investment in him over the years.
"We are not seeking to sell anybody unless they feel they want to leave."