Stoke City Chief executive Tony Scholes admits the club are worried about the potential exit of star forward Marko Arnautovic.
The 27-year-old's career has been revitalised at the Britannia Stadium since signing from Werder Bremen for £2million,
and has reportedly been offered a deal that would make him the club's highest-paid player.
Despite the lucrative offer on the table for the Austrian international, it's been reported that Arnautovic would prefer resuming talks after his the Euro 2016 campaign.
"I would love to appear more knowledgeable than anyone else on this. But the truth is it's in Marko's hands," Scholes told The Mirror. "And at the moment, the decision he's taken is that he doesn't want to sign yet.
"He's not out of contract for another year, albeit there is a release clause in his contract.
"We hope he will sign, but as I sit here now I can't give you a definitive answer on that."
Arnautovic, who has a £12.5million buy-out clause in his current deal, registered 12 goals and six assists this season to help the Potters finish ninth.