Juergen Klopp’s side had been 3-1 up on the night before Benfica struck twice late in the game on Wednesday to create a jittery finale to what had appeared to be a comfortable passage.
Liverpool manager Klopp made seven changes to the team, which drew with Manchester City at the weekend
The lead on the night lasted just 11 minutes though before Benfica pulled level through Goncalo Ramos, who beat Alisson Becker after a tackle from James Milner had fallen to him