 As a result, when Cercle promoted to the highest level, Boi was physically ready to take up his responsibility as a professional footballer.Before becoming a professional player, Frederik Boi worked for the Belgian bookstore Standaard Boekhandel as a computer programmer.Frederik Boi made himself immortal for the Cercle fans, scoring the only goal in the victory against city rivals Club Brugge on 17 December 2006.