Lille missed a chance to go top of Ligue 1 after being held by a Falcao-less Monaco 1-1, while Nantes beat Montpellier.
Nantes returned to winning ways with a 1-0 victory over Montpellier at Louis Fonteneau on Saturday night.
Monaco and Lens won 1-0 away to Nantes and Lyon respectively in Ligue 1 on Sunday, as Saint-Etienne and Rennes drew 0-0.
Radamel Falcao headed home a long-awaited goal to give Monaco a much-needed 1-0 victory at Nantes.
PSG secured their first Ligue 1 win of the season at home to Bastia, despite Zlatan Ibrahimovic picking up a knock.
Metz and Nantes both remain unbeaten at the start of the new Ligue 1 season after drawing 1-1 Stade Saint-Symphorien.