Schalke general manager Horst Heldt insist they're not seeking to sell Klaas-Jan Huntelaar.

Chelsea, Manchester United, Arsenal and Tottenham have all been linked with Huntelaar after his £17 million buyout clause was made public.

"Klaas-Jan Huntelaar is still under contract with our club," Heldt told Reviersport.

"He is pretty much aware that we are very keen to prolong his contract and as far as I know he is also keen to do so."