Barcelona, including the greatest player of all time in Lionel Messi, were beaten 4-0 in a breath-taking combination of skill and emotion.
"We are far away from giving up", said Klopp.
"Winning is hard but with a clean sheet, I don't know how they did it".
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He came out on top three times in his fight against Real Madrid for La Liga , and won the Premier League last season... They're still behind us [in the table], apart from Man City.
He travelled with the squad for Saturday's win at Newcastle as part of his on-going integration and will be on the bench at Anfield as Liverpool seek to overturn a 3-0 deficit against Barca on Tuesday night.
The rest of the first half didn't have the same chances, but the feeling was just as intense and Anfield was still brimming with belief in another two goals when the second stanza began.
"I am very thankful to Liverpool, to the fans and to the club, and obviously it's clear that if I score a goal against Liverpool [at Anfield] I won't celebrate it". Ernesto Valverde's side had won the first leg 4-1 at Camp Nou to put one foot in the last four of the competition, only to collapse in stunning fashion on Italian soil.
Liverpool, without two thirds of their strike force with Mohamed Salah and Roberto Firmino injured, took a seventh-minute lead when a poor headed clearance from Jordi Alba fell at the feet of Jordan Henderson, who burst goalwards.
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Rivalling Liverpool in Istanbul for the title of greatest Champions League fightback, Roma dumped out Barca in the Champions League quarter-finals in a result Messi and his side may recall ahead of their trip to Merseyside. It's easy to carp from the sidelines, but people don't realise what a stressful job being a manager is, and a European trophy at the end of the campaign will be a major achievement for whoever gets it.
Liverpool are more than capable of securing victory against Barcelona on Tuesday evening although whether they can do it by the margin needed is another question entirely. Here are some of the best Twitter reactions to Barcelona's loss. Incredibly, though, there was even more drama to come for Liverpool in Europe that season.
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