Jamie Carragher has labelled Liverpool’s opening 45 minutes against Real Madrid as one of their worst under Jurgen Klopp.
The Reds have an uphill task in the second-leg having lost 3-1 in the Spanish capital.
They went in at the break 2-0 down which was due to some poor defensive errors.
Carragher also reserved particular criticism for Naby Keita, who was hauled off before half-time, after he struggled to contain the Madrid midfield.
“That first-half performance I think is one of the worst I have seen under Jurgen Klopp in six years,” he told CBS Sports.
“There was nothing there going forward. No intensity. Given chances up. Lucky it was only 2-0.
“What I saw in the second half is what I thought I would see for 90 minutes where it was almost a 50-50 game. Real Madrid were still good in the second half. But Liverpool made a game of it.
“The first half was not acceptable. It was nowhere near good enough. They were miles off it. We talk about the team and the midfield that he picked.
“Naby Keita went into midfield to put pressure on Kroos and Modric and he was nowhere near them. And ends up getting brought off just before half-time.”
Mohamed Salah’s away goal gives Liverpool some hope, but Vinicius Jr’s brace still has Madrid as favourites to progress.
Klopp himself conceded that his side were not deserving of the win in Spain.
f you want to go to the semi-final, you have to earn the right to do so,” he told BT Sport. “We didn’t do that tonight, especially in the first half.
“We just didn’t play good enough football to cause Real Madrid more problems. We made it too easy for them.”