Stefan Thesker (born 11 April 1991) is a German footballer who plays as a centre back for Holstein Kiel.
Club career FC Twente Born in Ahaus, Germany, Thesker played for TuS Wüllen and Schalke 04 youth teams before moving to Netherlands, joining Twente in 2005 and subsequently signed his first professional contract four years later.
After featured for the Jong FC Twente, Thesker was loaned out to Fortuna Sittard for the rest of the season in the January transfer window. He made his Fortuna Sittard debut for the club on 21 January 2011, coming on as a second-half substitute, in a 3–0 loss against Dordrecht. He went on to make 15 appearance for Fortuna Sittard and at the end of the 2010–11 season, he returned to his parent club.
1899 Hoffenheim After seven years abroad, Thesker returned to Germany, where he signed for Bundesliga side 1899 Hoffenheim on 2 January 2012. Upon signing for the club, the club's managing director Ernst Tanner commented on his move, quoting: "Stefan is a development-oriented German junior player from one of the best schools in Holland who will continue his training with us. I am convinced of its qualities and wish him all the best for the start with us."
Shortly after signing for the club, Thesker was sent to the 1899 Hoffenheim II squad for the next two seasons. In the 2012–13 season, he was included on the substitute bench on three occasions. However, he suffered an Achilles irritation on his foot and was sidelined for several months. After returning from injury, Thesker finally made his TSG 1899 Hoffenehim debut on 9 March 2013 against Greuther Fürth, coming on as a second half substitute, in a 1–0 win. Towards the end of the 2012–13 season, Thesker appeared in the first team regularly, due to absent of Matthieu Delpierre and Patrick Ochs.
