However, substitute Roberto Firmino proved to be the match-winner with a stoppage-time goal, handing Liverpool all three points in their opening Group C game. "We were so strong and good with the ball", a relieved Klopp said.
Daniel Sturridge's Liverpool career seemed to be heading for a premature end last season but the striker showed on Tuesday he may yet have an important role after taking his chance during a rare start in the Champions League win over Paris St Germain.
The Liverpool manager had plenty of other striking options as back-up last season, but with Danny Ings having been loaned to Southampton and Dominic Solanke and Divock Origi injured, Sturridge was the only real choice to take Firmino's place. We know the players they've got but it's probably the only time they really opened us up.More news: Trump enthusiastic at North Korea missile pledge, others doubtful
"If you play against PSG you have to reach the next level".
Firmino, who came off the bench to net the victor against PSG despite suffering with an eye injury sustained against Tottenham, is likely to be fit to start against Southampton. Even with our depth, with our bench usually featuring the likes of Daniel Sturridge, Fabinho, Nathaniel Clyne, Xherdan Shaqiri and a rotation of midfielders.More news: 'Captain Marvel' Is Here to Save The World In First Epic Trailer
"He looked lighter and fresher in pre-season. If he stays fit, they've got another striker who two or three years ago we were talking about being absolutely world class, nearly winning the title".
Southampton will not have a more hard challenge in the Premier League this season than away at Liverpool and without Danny Ings.
Sturridge should have done better three minutes later when he made weak contact with Alexander-Arnold's cross on the right to see Areola smother his header, while Salah hit a first-time shot wide of the right post from 13 yards out after running onto Van Dijk's knockdown header on 72 minutes.More news: Morrison: Only one title challenger out of Liverpool and Spurs
She said: "It's a tall ask considering it's on the back of a World Cup year, but it has been a great start for Liverpool and ultimately they are in the driving seat".