Donnarumma will miss Sunday's Ligue 1 match in Lyon with Costa Rican Keylor Navas likely to fill in
Ligue 1: Lionel Messi is set to make his debut for Paris Saint-Germain (PSG), and will be hoping to put in a good display.
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.
Frustrated with the referee's decision, Ruben Aguilar kicked the VAR monitor, on his way to the tunnel.
Mario Balotelli showed off a new goal celebration as he took a selfie video with his teammates and posted it on Instagram during the game.
Julian Draxler, Edinson Cavani, Angel di Maria and youngster Moussa Diaby all found the net at the Parc des Princes.
Pierre-Emerick Aubameyang came off the bench to inspire Saint-Etienne to a 2-1 victory against Ligue 1 leaders Paris Saint-Germain at the Parc des Princes on Saturday in a day of contrasting fortunes for two of the league's leading strikers.
After their UEFA Cup victory in Moscow, Olympique Marseille returned to the French League with a bump when they lost 2-1 to Saint-Etienne on Sunday.