RCS started competition in Ligue 2 but immediately earned promotion to the top flight at the end of the 1933–34 season, going through a pair of two-legged playoff matches, first against Mulhouse (0–0 and 3–1), and then against AS Saint-Étienne (2–0 and 4–4).
RCS memulai kompetisi di Ligue 2 namun segera mendapatkan promosi ke papan atas pada akhir musim 1933-34, melalui sepasang pertandingan playoff bertahap dua, yang pertama melawan Mulhouse (0-0 dan 3-1), dan kemudian Melawan AS Saint-Étienne (2-0 dan 4-4).