“We’ve had two bids from Premier League clubs over two weeks ago that we turned down,” Grayson told Sky Sports News.
“They were nowhere near the target of the realistic aim that we are looking to receive, but I know that could change at any time.
“That’s football for you.
“As long as he’s contracted to us he’ll show and perform like he has done all over pre-season, but obviously we’re aware anything could happen as well.”
