German newspaper Junge Weltwere reporting Arsene Wenger had activated the 31-year-old's release clause on September 1.
"There was no approach from Arsenal or from any other club," Horst Heldt was quoted as saying by Kicker.
"Klaas-Jan is part of Schalke's core. We can definitely see him sign a contract renewal here.
"He is a great player, an absolute modern professional. He's always hungry for success and wants to achieve his goals."
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