Southampton manager Ronald Koeman has taken responsibility for his side's 6-1 loss to Liverpool in the League Cup at St Mary's on Wednesday.
The Saints took the lead in the first minute through Sadio Mane, but the Reds hit back with a Daniel Sturridge brace, a hattrick from Divock Origi and a further effort from Jordan Ibe.
"I think it was a great start in the game and a great goal from Sadio," Koeman told the club's official website.
"After that, until half time, we did some defensive mistakes and we were punished by great quality of Liverpool.
"But if you analyse the first goal it is out of a situation of a throw-in and it's too easy the space what we gave them. That was already the start of a difficult period in the game and it was 3-1 by halftime. It's difficult.
"The second half is my responsibility. I took the risk to play with three at the back to change the system and try to come back in the game.
"They punished us from incredible high quality in the space, which they had more of in the second half."