He said that playing football "is not a legitimate excuse for breakfast" during Ramadan
The Egyptian forward sprained his shoulder as he clashed with Sergio Ramos during the first half, before the Reds lost 3-1.
Kuwaiti preacher Bathali said that playing football "is not a legitimate excuse for breakfast" during Ramadan.
He said there was no excuse because jihadists fast despite being "in a state of war and facing the enemy". He did add that "the door of repentance is open".
Bathali clarified that Salah breaking his fast to play football was the sin but would have been all right if he had eaten breakfast to travel from the UK to Ukraine.
Before the match Liverpool physiotherapist Ruben Pons confirmed Salah - a hero across the Muslim world - would break his fast for the final after discussions with a nutritionist.
During Ramadan, Muslims fast during daylight hours for a month in between two crescent moons.
However, there are exemptions including travel and severe illness.
The preacher did not mention anything about Salah's fellow devout Muslim team-mates Emre Can and Sadio Mane, neither of whom were injured in the final.