Alassane Plea's goal earned Nice a 1-0 win over AS Nancy on Sunday that moves them top of Ligue 1.
Mario Balotelli scored twice as Nice beat Monaco 4-0 to go top of Ligue 1, while there were also wins for Lyon and Bordeaux.
Lyon missed the chance to climb up to third in Ligue 1 after they were held to a goalless draw against Marseille.
Mario Balotelli claims his ill-fated move to Liverpool was "the worst mistake of my life".
Mario Balotelli scored twice on his debut to inspire Nice to a 3-2 win over Marseille.
Mario Balotelli has left Liverpool and joined Ligue 1 club Nice on a free transfer.
Alexandre Lacazette was forced off with a knee injury as Lyon slipped up to Dijon, while Nice were held by Lille.
Man Utd will face Fenerbahce, Feyenoord and Zorya Luhansk in the Europa League, while Southampton are in a group with Inter Milan.
Liverpool striker Mario Balotelli has travelled to France to hold talks with Ligue 1 side Nice.
Gabriel Boschilia's strike gave Monaco a 1-0 win at Nantes on Saturday.
Nice and Rennes joined together on Sunday to pay tribute to the 85 killed in the Bastille Day terror attacks.
Alexandre Lacazette scored a hat-trick as Lyon started their Ligue 1 season with a 3-0 win at newly-promoted Nancy on Sunday.
Nice will pay tribute to the 85 victims of the Bastille Day attacks by wearing a commemorative shirt on Sunday.
Southampton have signed full-back Jeremy Pied from Nice to complete a busy day for the Premier League club.
Leicester have continued to strengthen for the new season with the signing of midfielder Nampalys Mendy from Nice.
Paris Saint-Germain have confirmed the signing of Hatem Ben Arfa on a two-year deal.
Hatem Ben Arfa is set to leave Nice this summer, according to the club's president Jean-Pierre Rivere.
Lucien Favre has taken over as head coach of Nice after the resignation of Claude Puel.
Former Newcastle winger Hatem Ben Arfa has revealed up to 18 clubs have declared an interest in signing him next season.
Hatem Ben Arfa has missed out on a place in the France squad for Euro 2016 but has been named on the standby list.