"We made life a bit too easy tonight, that's the problem".
Liverpool have just three victories in their last nine matches in all competitions-Red Star and Cardiff at home and Huddersfield away-and while not playing well was acceptable when they were winning, it takes on a different complexion after results like that in Belgrade.
The English club have now lost both of their away games in the group stage, having been beaten 1-0 at Napoli last month.
"We believe we can win every game, that's always been the case with us". Still unbeaten after 11 games, the only points they have dropped came in draws against other sides in the top five in Manchester City, Chelsea and Arsenal.
Red Star scored two quick goals in the first half, while Liverpool missed several guilt edged chances to get back into the game. The boys are very disappointed, I'm disappointed and we have to do better.
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"We had the first big chance with Daniel (Sturridge), a very big one. Shaq is our player, we love him, and he will play for us a lot of times, but not on Tuesday".
"We need to win our games, it's on our shoulders.it's in our hands but we will have to play better than we did tonight". In this case goal difference will come into play between Liverpool and Red Star Belgrade. In all areas, we didn't start and when you don't start well in the Champions League you can get punished. "They deserved it with the passion they showed". In the end you have to score goals in a game and if you think about how often we were in the box and around, that's what you have to do in a game but you have to make the last decision in the right way and we didn't.
The outstanding Borjan again denied Salah from close range in the 82nd minute as Liverpool piled on the pressure but the visitors could not find a way through Red Star's packed and well-organised defence. "It's not what we wanted", Klopp told BT Sport.
The pool is now wide open and with a hard trip to PSG followed by the visit of Napoli, the Reds need to up their level quickly if they are to navigate a path into the knockout stage.
"We'll definitely have a debrief and I'm sure a few things will be said". "We have to do better".