Liverpool face Red Star in an important Champions League clash, however he has warned that his players will need to step up their game.
The Anfield side won 1-0 in West Yorkshire on Sunday, however put in a below-par performance.
"We had this discussion last year. We don't concede a lot of shots on target and that's defending," Klopp told the 'Daily Mail'.
"It's like last year. I never had the feeling it's for granted. It's hard work.
"We have to really work for it and in the last game I was not the only one who felt a bit average.
"It was influenced in my case by the three big counter-attacks we had and did not finish off one. If we finish one it's done. We didn't. They had a half chance. I didn't feel good after the game.
"Make yourself ready for all the challenges you have, face them, solve them and win a football game."
"Nobody remembers the average games from last season. In the two draws we had in the Premier League we deserved a point. We deserved to lose against Napoli. That's how it is.
"We have to perform, we have to fight, do the right things in the right moment. It's not about showing that we can do similar to last season", he added.
Liverpool face Red Star Belgrade at Anfield on Wednesday night in the Champions League.