Lens will play in Ligue 1 next season after the French Football Federation (FFF) ratified its promotion from the second tier.
Having finished as runner-up in Ligue 2 last season, Lens was left waiting for its ascension to be confirmed due to financial troubles not satisfying the Direction Nationale du Controle Gestion (DNCG) - French football's watchdog.
The DNCG had suspended its promotion due to investment failing to materialise, however having taken its case to the French National Olympic and Sports Committee (CNOSF) Lens's hopes were raised.
Upon hearing the case, the CNOSF upheld the appeal and approved its promotion, with the FFF backing up its right to compete in the top flight alongside Metz and Caen in the top flight.
However, Lens will be to subject to some restrictions, which could include a salary cap and close scrutiny being placed over its transfers due to the federation's concerns.
"The Executive Committee of the French Football Federation, having taken note of the proposal of the conciliator appointed by the CNOSF in the case concerning Lens, decided to accept the proposal to remove the ban and confirm their promotion to Ligue 1, with a limit to the payroll of the club and/or have their recruitment controlled," the FFF announced on Monday.
"The Executive Committee therefore asks the competent body, professional DNCG, to meet as soon as possible to determine the appropriate participation of RC Lens in Ligue 1."
The decision ends the hopes Sochaux had of a reprieve from relegation, and allows Lens to prepare for its opening league fixture against Nantes.