Schalke are hopeful Klaas-Jan Huntelaar will sign a new deal but know the Netherlands striker is likely to have other offers.
• Schalke determined to keep Huntelaar
Huntelaar, 28, scored 29 goals last season as Schalke finished third in the Bundesliga, but his current contract expires next summer and it remains to be seen whether he will stay at the club.
Director of sport Horst Heldt believes it would be in the player's best interests to sign an extension but he told Germany's Sky Sports News: "It is up to Huntelaar.
"We want to extend his contract and I believe that it would make sense for both parties, but we need him to be 100% convinced. I cannot force any player to sign a new contract.
"Klaas Jan is an absolutely top-level footballer and of course he will have other options."