AS Saint-Etienne have lost three points after fans invaded the field last month in a match that resulted in the French side's relegation to the second-tier Ligue 2.
They received a six-point deduction with three suspended, the Ligue de Football Professionnel confirmed on Thursday after the crowd trouble that saw fans clash with police.
Saint-Etienne will also play their first four home matches without spectators at Geoffroy-Guichard, as two of the six-match ban they handed were suspended.
On May 30, Saint-Etienne lost the Ligue 1 Play-out Round Game 2 against Auxerre with 5-4 penalties and were relegated after 18 consecutive seasons in Ligue 1.
Following the defeat, their supporters clashed with police after marching the pitch to attack the players.
