Mathias Olesen is in advanced negotiations with the Danish club Sönderjysk Elitesport, according to bold.dk. SpVgg Greuther Fürth had previously announced that they would not obstruct the departure of the 25-year-old. Olesen was born in Copenhagen and is poised to join his first club in his birth country.

Defensive midfielder Mathias Olesen is a 25-year-old Luxembourgish international who was on loan from Greuther Fürth. The Styrians want to sign him. Talks are currently ongoing about a permanent transfer. Olesen has 39 caps and 2 goals for Luxembourg, and his current market value is €600k according to Transfermarkt. In the 2025/2026 season, he made 15 Bundesliga appearances, scoring one goal and providing two assists. He also made 12 appearances in the 2. Bundesliga, providing one assist.