Klopp upset after Liverpool suffer their first home defeat since January 2016.
Liverpool boss Jurgen Klopp couldn't explain his side's horrendous defending after they were beaten 3-2 at home by Swansea City on Saturday.
The Reds were two goals down after Fernando Llorente's second-half double (48th and 53rd minute) handed the Swans a comfortable lead.
Liverpool then responded via Roberto Firmino as the Brazilian scored a brace to draw the hosts level, but Gylfi Sigurdsson's 74th minute strike meant the awayside left Anfield with maximum points, leaving Klopp frustrated with his side's poor defending.
"In the first half there was only four or five moments. We expected it because we had to stay patient and create the moments where we could have scored and we couldn't do it," Klopp said.
"We needed what we didn't have in the first half, the kind of last punch in the right situations. We lose one challenge then Llorente is in front of the goalie. The first ball, then the second ball comes back. It's too easy obviously.
"[For the] second goal, we can defend the cross, it's why you should avoid crosses.
"These things happened. We came back and played really good, we deserved the first goal, deserved the second goal, and the most disappointing moment was [Swansea's] third goal because I have no explanation at this moment, there were four or five moments to have a challenge and one guy [Sigurdsson] is free.
"They had luck in the right moments, they weren't in front of our goal maybe more than the three times [they scored]. Is it fair? Maybe not. But is it deserved? Yes, because they took their chances."
On if Liverpool were complacent against a Swansea side in the relegation zone, Klopp said: "No, if you watch the game and I hope you did, you cannot ask this question.
"The situations with the goals was disappointing, [but] we didn't think about anything else in this game."