Both clubs were relegated when the season ended prematurely due to the COVID-19 crisis.
However, the Stade council, France's highest administrative court, earlier this month had suspended their relegations, demanding the French league rethink its format for 2020-21.
Regis Gurtner, Amiens
Image credit: Getty Images
However, French league clubs on Tuesday voted to maintain Ligue 1 at 20 clubs next season.
On Friday, the French federation said in a statement that the 2020-2024 convention between the FFF and the League, which featured an article that states Ligue 1 is to be played with 18 to 20 clubs only, had been approved.