Thiago Silva could miss several weeks of Paris Saint-Germain's Ligue 1 and Champions League campaigns after sustaining a thigh injury against Monaco on Sunday.
The Brazilian had to be replaced after just 16 minutes of the reigning French champions' 1-1 draw with the biggest challengers to their title at the Parc des Princes, and will undergo further medical examination on Monday to determine the full extent of the damage to his left thigh.
The 28-year-old's departure was followed just four minutes later by Radamel Falcao cancelling out Zlatan Ibrahimovic's fifth-minute opener, and PSG boss Laurent Blanc acknowledged the loss of his captain had altered the face of the game.
"Him coming off changed things, that's for sure," Blanc told the media following the match which left his team in second place, two points behind their league-leading opponents. "It's no coincidence that we conceded a goal four minutes later.
"We're going to do some tests, but I think that we've lost him for a while."
The former France coach admitted that his team would be worse off for the duration of their captain's injury.
"You have to be realistic," he added. "You can't lose Thiago Silva without experiencing some uncertainty.
"We all know what a player he is and we know that he's very reassuring for his team-mates."