Joaquin Seys is a Belgian left-back from Ostend. He joined Club Brugge's academy in 2012 after starting at Oostende, signed his first professional contract in 2022 and became a regular for Club NXT. He made his senior Club Brugge debut in the 2024 Belgian Super Cup, scored on his league debut against KV Mechelen, and soon appeared in the Champions League. He reached Belgium's senior team in 2025.