Ahly announced on Thursday that in-form midfielder Amr El-Sulaya is fit for the Egyptian Premier League game against Zamalek, which was postponed from week 17.
El-Sulaya sustained a minor knee injury on Saturday during the Egyptian national team's 1-1 game against Niger in the 2019 AFCON qualifiers.
"The [Ahly] medical staff spoke with their counterparts in the Egyptian national team to learn the state of El-Sulaya's injury and determine if he is fit for the game against Zamalek," read a statement on the club's official website early on Thursday.
"The national team's doctor confirmed that the midfielder is fit to take part in the Cairo derby game."
The 29-year-old midfielder missed the friendly game against Nigeria due to his injury.
Ahly and Zamalek will meet at Alexandria's Borg El-Arab Stadium in a postponed match that could define the season.
Egyptian Premier League leaders Zamalek failed to restore their four-point lead on the teams' table after being held to a 2-2 draw with Arab Contractors last week. Ahly thrashed Petrojet 4-0 in their last league match on 4 March.
Ahly currently lie second on the league table with 51 points from 22 matches, just two behind Zamalek.
(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)