Klopp cannot quite put his finger on what it is which is affecting his side, but admits had they taken the relatively simple opportunity which dropped to Daniel Sturridge - starting in place of Roberto Firmino - in the 17th minute the outcome could have been so different.
The result puts them behind the eight ball with games to come against Paris Saint-Germain and Napoli. "He needs two proper sessions for his fitness, which he will get at Melwood", Klopp said.More news: Demi Lovato breaks social media silence with voting selfie
Speaking of the Switzerland international's situation, the manager said, "We have heard and read the speculation and talk about what kind of reception Shaq would receive and although we have no idea what would happen, we want to go there and be focused 100 per cent on football and not have to think about anything else, that's all".
"We had chances and we came out at the start of the second half which was better, but we weren't ruthless enough and we weren't patient enough", Lallana told the club's official website.
"That's the Champions League and there's no teams that enter this competition that give you wins", the England global continued.More news: Harvick makes Championship 4 with OT win at Texas
Liverpool had the briefest of openings, but, uncharacteristically, Adam Lallana's first touch let him down as he tried to control Salah's square pass inside the penalty area. Last season we were scoring a lot of goals and they were going in and now they're not.
Klopp regularly conducts analysis with his players the day after a game, having reviewed the match himself at least twice but Wednesday's debrief assumed a more critical air given the nature of defeat and the precariousness of Liverpool's position in the group. "The gaffer, win or lose, always speaks more the day after because that's when he can clear his head and that's where he gets the best out of us". Robertson insists Klopp's side will be confident of victory despite their poor European away form.
Away from home last season we were very good in the Champions League.More news: FA appeals against decision to clear José Mourinho over touchline language
"We made life a bit too easy for Belgrade".