Leeds manager Neil Warnock is anxious not to lose striker Ross McCormack - especially if he cannot bring in a replacement.
The Elland Road club have already sold Robert Snodgrass to Norwich and, with McCormack in the final year of his contract, had been widely expected to cash in on the Scot this summer.
But the 25-year-old scored twice in a friendly win at Torquay and Warnock admits he is uncomfortable letting the former Cardiff man leave if he cannot sign an alternative.
"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 Snodgrass and McCormack without replacing them. Where would the goals come from?"
McCormack, who joined Leeds in the summer of 2010, was the club's leading goalscorer last season with 19 goals.