"I've thought about this decision long and hard and I'm very grateful that the club officials allowed me the time to do so. But now I've made the choice I'm most comfortable with," Huntelaar, 29, said on the club website.
"I've always felt at home at Schalke, with the club and the fans, and I want to send out a positive signal now because I believe in our team and I believe we can still achieve a great deal in the second half of the Bundesliga season.
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