In the 2006–07 season, Abdou missed the first half of the season, due to being suspended and playing in the club's reserve side. It was not until on 18 November 2006 when he made his first Ligue 1 appearance of the season, coming on as a substitute for Jérôme Le Moigne in the 49th minutes, and scored an own goal, in a 1–0 loss against Olympique Lyonnais. Abdou became a first team regular for the side since returning from the sideline. However, later in the season, he soon found himself out of the first team, due to being suspended. Abdou played one season in Ligue 1 in Sedan finished in 19th place and were relegated.