Paris Saint-Germain claimed a 3-1 win over Ajaccio in the Coupe de la Ligue round of 16 on Wednesday.
St Etienne missed the chance to close the gap to third-placed Lyon after they were held to a 0-0 draw at Nice.
Zlatan Ibrahimovic celebrated his return to action with a brace of goals as Paris St Germain beat Nantes 2-1.
St Etienne climbed at least temporarily ahead of rivals Lyon into third place in Ligue 1 with a 1-0 win over Bastia.
St Etienne followed up their derby victory over Lyon by seeing off Montpellier 2-0 to climb to third place in the Ligue 1 table.
Lyon suffered a first defeat since August in Ligue 1 on Sunday night, while Bordeaux claimed a 1-0 win over Lille.
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