Fynn Seidel

Career Seidel played for VfL 05 Hohenstein-Ernstthal and Oberlungwitzer SV in his youth, before joining the academy of Chemnitzer FC in 2015. In 2020, he joined the youth team of SpVgg Unterhaching, signing a three-year contract lasting until 30 June 2023.

Seidel made his professional debut for Unterhaching's senior team in the 3. Liga on 27 January 2021, coming on as a substitute in the 76th minute for Lucas Hufnagel against VfB Lübeck. In doing so, he became the youngest player in the history of the 3. Liga at the age of 16 years and 362 days. This broke the previous record of 17 years and 18 days set by Viktor Zentrich on 1 July 2020. The away match finished as a 1–0 loss for Unterhaching.

On 20 June 2023, Seidel joined Regionalliga Nord club SV Meppen, who had just been relegated from the 3. Liga. Under coach Adrian Alipour he finished the season as a runner-up in the division and won the Lower Saxony Cup, registering four goals and nine assists in 19 league matches despite a cruciate ligament injury that sidelined him for four months.

On 20 June 2024, Seidel returned to Unterhaching, by then back in the 3. Liga. He made little impact and, after being told he had no future at the club beyond the winter, dissolved a contract that ran until 2026.

On 7 January 2025, Seidel moved to his boyhood club Chemnitzer FC of the Regionalliga Nordost on a free transfer, signing until the end of the season and taking the number 7 shirt.

Honours SV Meppen Lower Saxony Cup: 2023–24