The Dutchman opted to put contract discussions on hold until after Euro 2012, but with the new Bundesliga season fast approaching, he is yet to put pen to paper on a new deal.
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Heldt, speaking to Sky Sports News Germany, revealed that he hopes to resolve the issue within the coming weeks, but remained optimistic about the Gelsenkirchen club's immediate future.
"Klaas-Jan knows what he has here at Schalke and we know about his quality," he said. "His decision depends on his sporting future. We had a talk last weekend and we will have another talk in the next few days and make a decision.'
"We can prepare well for the future and we know what we want to achieve in the future.
"Klaas-Jan is a footballer on a high level, but we also have different options."
The 28-year-old joined Schalke from Italian giants AC Milan in August 2010 and struck 29 league goals last season as he ended the campaign as the Bundesliga's top marksman.