Paris Saint-Germain coach Thomas Tuchel admitted "everyone is worried" after Kylian Mbappe hobbled off out of their French Cup final victory with an ankle injury.
Mbappe received lengthy treatment after his right ankle was caught in a dreadful challenge from Saint Etienne captain Loic Perrin that resulted in a red card for the centre-back.
"Everyone is worried. Everyone who saw the foul is worried. Of course I'm worried," said Tuchel after his team's 1-0 win.
A tearful Mbappe was replaced by Pablo Sarabia but the greater concern for PSG will be the severity of his injury ahead of next month's Champions League quarter-final against Atalanta in Lisbon.
He re-emerged from the Stade de France tunnel later in the second half on crutches.
"It's the third game against Saint-Etienne and it's a third red card, each time in the first 30 minutes," added Tuchel. "It's not all good news for us."
PSG face Lyon in the French League Cup final next Friday before resuming their European campaign against Atalanta in a unique straight knockout tournament at the Estadio da Luz on August 12.
"I hope Kylian is going to recover as quickly as possible because he's a vital player for us," said PSG captain Thiago Silva.
Saint-Etienne boss Claude Puel admitted the forward was simply too quick for the 34-year-old Perrin.
"I hope it's a minor injury for Kylian. The intention was to play the ball but it's true that he was too fast," said Puel.
Neymar scored the winning goal in the first competitive fixture in France since March 11 following the coronavirus pandemic.
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 before the resumption of their European campaign in Portugal.
"It was very difficult, which is perhaps the best thing," added Tuchel, whose side added to their Ligue 1 title awarded in April after the season was ended prematurely.
A minute's applause was held ahead of kick-off for the victims of Covid-19, which has claimed the lives of more than 30,000 people in France.