The Dutch midfielder appeared just three times in the K-League. Musampa, a former Netherlands U-21 international, made his debut on April 16 and played his last game in a Seoul shirt on May 3.
Reports in the local media suggest that the 30 year-old has struggled to adapt to the demands of Korean football.
According to Yonhap News, FC Seoul chief Han Woong-soo said: "We have decided to end Musampa's stay with the club. At the moment we are talking about contract matters with the player's management."