Four people are in custody with further arrests expected after Nice fans invaded the pitch following Saturday's 1-0 home loss to Bastia.
Around 100 fans, members of the Populaire Sud ultras group, charged onto the pitch at the Allianz Riviera, sending both sets of players running for safety.
The incident was sparked when Bastia's substitute goalkeeper Jean-Louis Leca brandished a Corsica flag during the postmatch celebrations, provoking an angry reaction from Nice captain Didier Digard.
Thiago Silva has acknowledged he should never have played in the friendly in which he sustained the injury that has sidelined him for more than two months.
After playing Paris Saint-Germain's opening league game of the season having only just returned from his post-World Cup break, Silva, 30, suffered a hamstring injury early in a game against Napoli on Aug. 11 and has not played since.
PSG boss Laurent Blanc admitted he was at fault after being heavily criticised for playing Silva so soon after...