Leeds manager Neil Warnock wants to keep striker Ross McCormack at Elland Road.
McCormack is in the final year of his contract and had been expected to leave this summer after turning down a new offer from Leeds, but the 25-year-old has featured in recent friendlies and scored two goals in a 2-1 win at Torquay.
"There have been a couple of clubs ask about buying him, but we don't want to sell him unless there is a player exchange," Warnock told Yorkshire Radio. "I'd rather keep him and Ross knows that. I think we'll have to play it by ear. If Ross starts to enjoy himself, which I think he is, then we'll see how it goes.
"We can't lose players like [Robert] Snodgrass and McCormack without replacing them. Where would the goals come from?"
McCormack, who joined Leeds from Cardiff in the summer of 2010, was the club's leading scorer last season with 19 goals.