Huntelaar was born on August 12, 1983 in Voor-Drempt. The striker has played at Ajax since the 2017/2018 season and also played for the club from 2006 to 2008.
Huntelaar made his debut in Amsterdam on January 15, 2006 in the match Ajax vs. N.E.C. (1-1) and played a total of 257 official matches, scoring 158 goals.
Huntelaar was a league champion with Ajax in 2019 and additionally won the KNVB Cup in 2006, 2007, and 2019. He also won the Johan Cruijff Shield in 2007 and 2019.
Marc Overmars: "It was Klaas Jan's wish to help Schalke avoid relegation in the last four months of his career. We thought it was important for him to let this move go through and fill his shoes internally with Lassina Traoré and Brian Brobbey. We wish the best for Klaas Jan with this transfer and thank him very much for everything he has done for Ajax."