كتب : Hatem Maher
The Egypt guardian joined Ismaili in the close season from Swiss side Sion for a fee of €600,000.
The Dervishes were worried that they could miss him against newly-promoted side Mansoura but he has now been given the all-clear to play.
Al-Hadari, 36, will wear the number 19 kit.
Meanwhile, skipper Mohamed Hommos will miss the game with a leg injury.
However, Ismaili have received the international clearance for Tunisian striker Mohamed Selliti.
Left-back Ahmed Abou-Mosallam is the only new arrival who is yet to become eligible to play.