Marseille are reported to be preparing an official complaint to the city's authorities after protesting fans blocked the team coach on its way to last weekend's home game against Troyes.
The coach was forced to take a detour and arrived 15 minutes late after around 100 supporters - who believe their club has been allowed to fall behind Paris Saint-Germain - gathered at a roundabout on the route to the stadium.
The fans, who had organised their demonstration without police permission, let off flares and brandished banners calling for the resignation of Marseille sporting director Jose Anigo.
L'Equipe reported that Marseille were ready to make an official complaint to judicial authorities on Thursday over "public provocations and obstructing traffic."
The paper said club officials hoped an inquiry would enable them to identify the organisers of the protest, who had used psuedonyms on social networks.
After his team's unconvincing 2-1 win over Troyes, coach Elie Baup said the fans were "not helping" the team by disrupting their pre-match preparation, while president Vincent Labrune told the club's official website that there was an orchestrated plot to "destabilise" OM.
L'Equipe reported that fans were planning a repeat of the protest before the home game against Ajaccio on March 15.