Veteran striker Klaas-Jan Huntelaar has returned to Schalke for a second spell to help the club in their fight against relegation from the Bundesliga.
The 37-year-old, who scored 126 goals in 240 games in seven seasons at Schalke from 2010 to 2017, joins from Ajax on a short-term contract until the end of the season.
Schalke are rock bottom of the Bundesliga with just seven points from 16 games. Koln are five points ahead in the relegation play-off spot, while Arminia Bielefeld sit a further two points up in safety.
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“We need to win games and score goals to climb up the table,” Huntelaar told the club’s official website.