Alex Oxlade-Chamberlain and Sadio Mane increased Liverpool's lead in an astonishing opening half to the all-Premier League clash.
"First half, it was typical Liverpool on the front foot". It was how football should look.
However, the Liverpool fans didn't allow that to get in the way, as they delivered a very clear message when Pep Guardiola sent the England global on.
Klopp's caution is born out of the fact that City thrashed 10-man Liverpool 5-0 in their only previous meeting at the Etihad this season.
"Then we have a job to do next week again".
"I wanted us to play more football".
The only clouds on a golden evening for Klopp were a muscle injury to Egypt star Mohamed Salah and a booking for Henderson that rules the Liverpool captain out of the second leg, reported AFP. You play the league and usually go on holiday but this one feels completely different.
"We beat the best team in the world, that's a pretty good performance", he said with a knowing grin. The German was particularly pleased that City did not produce a shot on target in the entire game.
City boss Pep Guardiola conceded his team could have no complaints after a rare limp display. "There is no way they would have visualised being 3-0 down after the first leg tonight", Keane said.
Liverpool face a nervous wait to find out the severity of Salah's injury, particularly with the second leg against City taking place next Tuesday. The first two goals, we had control of the game but they scored.
"With all the things I could say now, like very positive, I make them even more angry".
Two own-goals, from Daniele De Rossi and Kostas Manolas, and a close-range finish from Gerard Pique, presented the Catalans with a flattering 3-0 advantage at the Camp Nou before Edin Dzeko snatched Roma a late away goal. That was tough but for the rest of the game we were so, so good.
Legendary Chelsea striker Didier Drogba is still the African with the most Champions League goals overall, but despite his 50 goals in the competition, the Ivorian never managed to score more than six in a single campaign.