Ajax striker Klaas-Jan Huntelaar is back at Schalke, the official club website states.
By the end of the season, the 37-year-old player from the Netherlands had signed a deal. He is going to feature as number 21.
From 2010 to 2017, the forward played for Schalke. For the Gelsenkirchen-based club, Huntelaar scored 126 goals in 240 matches.
At the end of the season, the player had previously stated his intent to terminate his career.