Neymar missed training because of gastroenteritis and his fitness will be assessed later in the day ahead of Sunday's trip to face bitter rivals Marseille
French football remains mired in financial uncertainty months after a huge broadcast rights deal with Mediapro fell through.
The fans, who were demonstrating against the club leadership and the team's poor recent run of results, assembled in the afternoon in front of Marseille's La Commanderie training ground, throwing smoke bombs and firecrackers.
Neymar's return is good news for PSG, who have been dealing with a string of injuries recently and trail league leaders Lyon by one point after 19 games.
Ligue 1: 'Any big player is welcome at PSG', new manager Mauricio Pochettino responds to Lionel Messi links
The Argentine was asked several times about Messi at his first press conference since being named coach of PSG, with the Barcelona superstar now free to negotiate with other clubs as his contract runs out in June.
Ligue 1: News of Thomas Tuchel's PSG sacking came as a 'shock', says former manager's assistant Zsolt Low
Relations between Tuchel and PSG sporting directora Leonardo had soured in recent months, with "different principles of governance" driving a wedge between the pair, according to the Hungarian.
Neymar was hurt deep into injury time in last Sunday's 1-0 home loss to Lyon, when his left ankle buckled under a heavy tackle from Thiago Mendes and he was stretchered off the field.
Ligue 1: PSG suffer Neymar injury setback as they lose to Lyon; Lille claim top spot after beating Bordeaux
Neymar incurred a left ankle injury in the seventh minute of injury time at Parc des Princes following a heavy tackle from Thiago Mendes, who was then red carded.
Ligue 1: Lille play out 1-1 draw with 10-man Lyon to remain unbeaten, trail leaders PSG by two points
Jonathan Bamba put Lille ahead in the 21st minute with a fine strike, but Lyon equalized in the 40th when Lille defender Zeki Celik diverted an effort from Houssem Aouar into his own net.
Rennes could have moved to the top of Ligue 1 with a victory, instead, they suffered their first defeat of the season as, for the fourth time in four games, they blew a lead. This time they did not even gain a draw.
The 35-year-old Yılmaz netted 229 goals during a long career in Turkish football in which he starred for Istanbul-based Galatasaray, but had not scored in his first four games for Lille.
Paris Saint Germain (PSG) captain Thiago Silva is to leave the Ligue 1 champions after eight years at the club, French media have reported.
Neymar was sent off as Paris Saint-Germain overcame more sloppy defending to beat Bordeaux 4-3 on Sunday and move 13 points clear at the top of the French league.
Ligue 1: Paris Saint-Germain, Amiens play out thrilling draw in dramatic contest; Nice beats Toulouse
Error-strewn Paris Saint-Germain trailed 3-0 and then recovered to lead 4-3 before conceding an injury-time equalizer to Serhou Guirassy in his second goal of the game.
PSG moved to 33 points ahead of second-placed Olympique Marseille, who visit second-bottom Toulouse on Sunday, while Lille are seventh on 19.
Ligue 1: Dimitri Payet's brace propels 10-man Marseille to narrow win over Lyon in violence-marred derby contest
Marseille supporters attacked the Lyon bus with stones, bottles and other projectiles on its way to the stadium, before visiting players were repeatedly bombarded with objects thrown from the crowd while taking corners during the match.
Mbappe started as PSG beat Club Brugge 1-0 with a Mauro Icardi goal to secure their place in the last 16 of the Champions League.
Ligue 1: Robert Beric's last-minute strike guides Saint-Etienne to narrow win over Lyon; Nimes hold Lille to a draw
Lyon began the weekend in trouble of their own, languishing a disappointing 11th after a domestic six-match winless run but buoyed by a Champions League victory at RB Leipzig.
LaLiga: Lionel Messi says he 'does not know if Barcelona did their best to bring back Neymar' from PSG
The summer transfer window saw an on-off soap opera surrounding Neymar's apparent desire to leave PSG, who paid a world record 222 million euros ($264 million at the time) in 2017, with Barcelona and Real Madrid both linked.
Ligue 1: Players, managers and officials divided in French football's fight against homophobic banners and chants
Prosecutors in Nice revealed on Thursday they had opened an investigation after Nice fans caused the suspension of Wednesday's 2-1 home defeat by Marseille by unleashing a volley of homophobic chants and banners that forced referee Clement Turpin to lead the players off the field