The Egyptian giants have battled through to the showpiece of the continental competition, where they face Wydad Casablanca in a two-legged decider.
Having drawn the first leg 1-1 in Alexandria, the club subsequently decided to open training up to supporters ahead of the decider.
The plan backfired, however, when tens of thousands descended on the Mokhtar El-Tesh stadium in Cairo and made continuing the session impossible.
Fans flooded the pitch, meaning an early end to training for Al-Ahly ahead of the second leg in Casablanca.
It might not have been ideal preparation, but the club can be in no doubt that they have fans' backing as they bid for glory on Saturday.