The Reds went down to a 2-1 defeat in the Premier League at Old Trafford on Saturday, with an Eric Bailly own goal in the second half insufficient to cancel out a couple of Marcus Rashford efforts for the hosts.
"We have to defend these situations better", Klopp told Sky Sports News after the game.
"If you are in Manchester you need a little bit of luck or help with right decisions, not wrong decisions". It is really hard to do against a team like Manchester United. The way we play is good for all of our players. "You can always lose a header or a challenge with Lukaku of course but there is a gap in behind and we need to close that", he said.
The season is far from over, but with Liverpool shockingly breaking the 100 goal barrier with two full months remaining in the 2017-18 campaign, the time is surely ripe for a retrospective on the glorious strikes that have defined the season to date.
"In the second half we chased the game which against a team like Manchester United is really hard".
"United were more lucky in these situations and that is the result we have to take".
On why Liverpool weren't at their best, he added: "I have no explanation for that because it's clear".