Al Ahli doctor Khaled Mahmoud revealed the details of the injury suffered by defender Ayman Ashraf against the Equatorial Guinea champions Kano Sport.
Al Ahly beat Kano Sport 2-0 in the first leg of the African Champions League round of 32, in the first match of Swiss coach Rene Feiler.
"Ayman Ashraf is straining the back muscles of the feet so he was unable to complete the match," Khaled Mahmoud said after the match.
"The player will undergo a medical examination after returning to Egypt to determine the duration of his absence from the team."
Ayman Ashraf left the game in the 83rd minute, strained and replaced by Yasser Ibrahim.
Al Ahli will play the second leg against Kano Sport on September 27 in Egypt.
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