With just seconds left in the game, the Brazilian appeared as a bonafide striker as he rose majestically to head past Sam Johnstone.
It is the first occasion in which a goalkeeper has scored a competitive goal for Liverpool since they were founded in 1892.
But Alisson's huge moment keeps Liverpool in the hunt for a top-four place.
The Reds are one point behind Chelsea and three points behind third-placed Leicester.
With the Blues and Foxes set to play each other on Tuesday, Jurgen Klopp's side have a huge chance of making the Champions League places.
"I just tried to run into a good place and be there to try and help my players, to bring a defender, but no one followed me and I am lucky and blessed, sometimes things you can't explain," Alisson told Sky Sports.
"You can't explain a lot of things in my life, the only reason is God and he put his hand on my head today and I'm feeling very blessed.
"I'm too emotional, this last month for everything that has happened with me and my family, but football is my life, I played since I can remember with my father.
"I hope he was here to see it, I'm sure he is celebrating with God at his side."