Mohamed Salah scored the only goal of the game in the 34th minute at Anfield to send Liverpool into the round-of-16 of the Champions League, although they could have been down to 10 men before the goal was scored.
But, with a Napoli goal sending Liverpool into the Europa League, Alisson, the £65 million summer signing, made a crucial save to deny Arkadiusz Milik from close range. "And the save Ali made - I have no words for that", Klopp said at his post-match news conference.
And they were almost made to pay in stoppage time when Alisson Becker produced a crucial save to deny Arkadiusz Milik a dramatic equaliser. It was life-saving tonight.
'He has helped us a lot and I hope he can perform until the end of the season and continue making important saves for us. "Still he did it, incredible, unbelievable, never saw anything like it". That was, of course, a lifesaver.
"Our offensive defending and pressing was some of the best I ever saw".
Mohamed Salah's duel with Napoli center-back Kalidou Koulibaly was tipped to be one of the most interesting match-ups of the night and the battle stayed true to its billing as the pair faced off several times during the match.
"I am really proud of the boys".
Klopp says £67m Alisson ‘worth double’ after save puts Liverpool through
It would have been a wonderful achievement to qualify from a really hard group and many people didn't think we would take it this far.
Napoli had not been beaten in Europe this season before travelling to England's north-west and showed the danger they posed when Marek Hamsik fired inches over from Mertens's cross.
Paris St Germain's 4-1 victory at Red Star Belgrade meant they finished top with 11 points while Napoli, who started the day leading the way, exited the competition as Liverpool snatched second spot on goals scored after both teams finished with nine points.
"We had to do it like how we did it in the first half".
"And that's fine. I have to praise the team".
Defender Joel Matip was taken to hospital as a precaution to have a shoulder injury looked at while Trent Alexander-Arnold (foot) and James Milner were also forced off. "Didn't know the camera got us thanks for posting".