Paris Saint-Germain beat resilient third-division side Les Herbiers 2-0 in the French Cup final on Tuesday.

It secured a domestic treble for PSG but it was a scrappy performance when a resounding win was widely expected.

Les Herbiers is a small town in western France with a population of 16,000, five times less than the capacity of the Stade de France.

PSG fielded its strongest side and went close several times before midfielder Giovani Lo Celso opened the scoring after 26 minutes.

PSG then missed a succession of chances, and had a goal from Kylian Mbappe disallowed by the Video Assistant Referee system, before Edinson Cavani slotted in a penalty in the 74th minute.

Roared on by its red-and-white contingent of around 15,000 fans, Les Herbiers went close when substitute Clement Couturier raced through in injury time.

PSG coach Unai Emery hugged his counterpart Stephane Masala after the final whistle, visibly impressed by the way his superbly-organized side had resisted so well.

While PSG secured its fourth straight French Cup and League Cup double, Les Herbiers' players continue their fight to avoid relegation to the fourth tier with a crucial match on Friday.