Schalke general manager Horst Heldt has refused to comment on speculation linking the Bundesliga outfit with Arsenal forward Lukas Podolski.
The German international is under contract at the Emirates until June 2016 after switching to the Gunners from Cologne last summer.
Previous to his move to England, the 28-year-old had spent his entire career playing in his homeland and speculation has emerged of a possible return.
But Heldt said: "I am unable to make any statement on this rumor at this point in time."
The agent of Podolski, Kon Schramm also refused to comment on the rumors.
"I have never been out to comment on speculation like this," he told Bild.
"And Lukas Podolski is under contract with Arsenal. This is a fact."