Mbappe and Neymar were both forced off injured while representing their respective countries just eight days before facing Liverpool.
Mbappe’s injury in the 1-0 win against Uruguay looked particularly bad as he fell awkwardly on his shoulder and was in a lot of pain before leaving the field.
Brazilian star Neymar pulled a groin muscle when trying to put a cross in Brazil’s 1-0 victory over Cameroon at Stadium MK.
The forward looked distraught as he was taken off the pitch.
France coach, Didier Deschamps was unable to confirm the extent of the injury but admitted his player was in pain.
“He has a sore shoulder, he’s fallen badly,” he said.
“He will have to see with the medical staff. I hope it’s not bad.”