Mohamed Salah rejected Liverpool's request to have a pre-match scan on an undisclosed injury before the forward played 90 minutes for his country on Sunday.
The 29-year-old captained the side to a 1-0 victory over Guinea in Cairo as Egypt began their qualifying campaign for next year's Africa Cup of Nations.
"Salah was hit by an injury but played through it," said manager Ehab Galal.
He added Salah's X-ray would take place after the game.
Egypt are scheduled to play an Afcon group match against Ethiopia in Malawi's capital Lilongwe on 9 June and a friendly against South Korea the following Tuesday.