PSG defeated Lyon 6-5 on penalties in the French League Cup final to claim another domestic treble.
PSG said medical imaging had confirmed the initial test results of a sprained right ankle, with Kylian Mbappe also sustaining ligament damage.
Kylian Mbappe hobbled off in the first half of the French Cup final after a dreadful tackle by Saint-Etienne captain Loic Perrin.
Kylian Mbappe was hacked down by Saint-Etienne captain Loic Perrin in the first half of the French Cup final which resulted in a mass brawl on the field.
A tearful Kylian Mbappe was replaced but the greater concern for PSG will be the severity of his injury ahead of next month's Champions League quarter-final.
PSG secured the first of a potential three trophies this summer, claiming a record-extending 13th French Cup with the League Cup final against Lyon to come next Friday before the resumption of their European campaign.
The French government relaxed the health protocols before the weekend to allow for a total attendance of 5,000, including players, journalists and staff, at games.
The coronavirus crisis has left Paris Saint-Germain apparently weakened both on the field and off it.
Instead of Kylian Mbappe, Harry Kane or Cristiano Ronaldo racing around the pitch, gamers will slug it out, contesting the first ever eEuro from their armchairs.
Paris Saint-Germain, whose bid to avoid yet another exit in the first knockout round against Borussia Dortmund will be played out before an empty stadium on Wednesday.
Kylian Mbappe hit a hat-trick as Paris Saint-Germain cruised into the final of the French Cup with a thumping 5-1 win at Lyon on Wednesday.
PSG beat Bordeaux 4-3 on Sunday, but their victory was marred by Neymar's late sending-off.
Paris Saint-Germain were the beneficiaries of possibly one of the most comical own goals ever seen in professional football.
Kylian Mbappe reacted furiously after being substituted by Thomas Tuchel midway through the second half.
Kylian Mbappe netted either side of Neymar's effort before Mauro Icardi added a late fourth for PSG vs Amiens at the Parc de Princes.
Kylian Mbappe's smart finish shortly after half-time and Neymar's late penalty saw PSG ease to victory at the Parc des Princes.
Two goals in two minutes from Kylian Mbappe and Pablo Sarabia helped PSG come back from a 2-0 deficit and snatch a draw against Real Madrid.
Jurgen Klopp said that buying a player of Kylian Mbappe is difficult and that he doesn't see any club that can currently buy him from PSG.