Sylvester Jasper joined Železničar Pančevo after mutually terminating his contract with Śląsk Wrocław. He signed a contract with the Serbian team until the end of the 2026/2027 season. Previously, he played for Śląsk Wrocław, where he appeared in 21 matches, starting only nine and providing two assists without scoring any goals. He has a background with Fulham, Colchester United, Bristol Rovers, and Hibernian FC. Before Śląsk Wrocław, he played for Portimonense in Portugal. Transfermarkt currently estimates his market worth at 300k euros.