Paris Saint-Germain will be worried about Neymar's injury, says club colleague Eric Maxim Choupo-Moting.
Neymar appeared to hurt his groin early in Tuesday's international friendly win over Choupo-Moting's Cameroon on Tuesday.
The Brazil captain was withdrawn after only eight minutes of action, though replacement Richarlison went on to score the only goal of the game.
Brazil doctor Rodrigo Lasmar eased fears over Neymar's fitness, telling SporTV: "It does not appear to be a serious injury". However, he said a scan will be needed on the injury.
PSG face Liverpool in a crunch Champions League clash on November 28, with Neymar's fellow forward Kylian Mbappe also injured on international duty.