Andy Robertson urged Liverpool to "wake up quickly" after a dire first-half performance resulted in a 4-1 humbling at Napoli in their Champions League opener on Wednesday.
Liverpool have failed to live up to early expectations in the Premier League, winning just twice in six games, and their poor start to the season continued in Naples.
Piotr Zielinski converted from the penalty spot after just five minutes, before Alisson denied Victor Osimhen's spot-kick – but that only denied the inevitable for the out-of-sorts Reds.
Andre-Frank Zambo Anguissa and Giovanni Simeone, the latter on his Champions League debut, added further goals before half-time, with Zielinski adding a fourth after the interval.
It was just the fourth time Liverpool have found themselves three goals down at half-time in the competition, with Luis Diaz's second-half strike making little difference for Jurgen Klopp's side.
The thrashing marked the Reds' joint-heaviest defeat in the Champions League, and Robertson offered an honest appraisal after the game.
"We were miles too open. You can't come to a place like this and not be compact. They were by miles the better team," the Scotland international told BT Sport.
"Too many times they had spaces to run at us and cause us problems. You come away in the Champions League and you can't be wide open like that. We have to get back to basics and be compact.
"We deserve this result, even though we created chances. The way we were wide open they found so many spaces, that's not like us. It felt like they had an extra man.
"You have to be ready to fight. We weren't close enough to our mate when they went to press the ball, people weren't backing each other up soon enough.
"They hit the post within the first minute then they get a penalty, and another one and you're 3-0 down. We had two good chances to make it a bit different – but you can't dwell on that.
"We have to wake up quickly because we can't perform like that."
Liverpool will look to respond at home to Wolves in the Premier League on Saturday before hosting Ajax, who smashed Rangers 4-0 in Group A's other game on matchday one.
Juventus 0-0 Milan: Goalless draw ensures Rossoneri retain grip on second
Juventus and Milan played out a 0-0 draw at a sold-out Allianz Stadium in Serie A on Saturday, with both sides still seeking to secure Champions League spots for next season.
Midfielder Filip Kostic and striker Arkadiusz Milik had great chances to give Juventus the lead in the second half but Milan goalkeeper Marco Sportiello showed off his skills to keep their attempts out.
The Rossoneri finished the game without a shot on target as the contest finished goalless, leaving the sides to share the spoils.
Milan remain second in the standings on 70 points while Juventus remain third on 65, after Inter sealed the title on Monday.
‘Too many draws have cost us’ – De Zerbi
Roberto De Zerbi has highlighted too many draws as Brighton’s problem this season while looking ahead to their trip to Bournemouth on Sunday.
The Seagulls suffered a heavy 4-0 defeat to title-hopefuls Manchester City on Thursday, extending their winless run to five games.
Despite sitting in 12th, Brighton still have an outside chance of getting a European place next season, though they would have to win all five of their remaining matches against teams above them in the table.
Asked how his side will approach a tough fixture list at the end of the season, De Zerbi said: “It’s not a good thing we’re playing teams above us. We should be better. Chelsea and Bournemouth are very close with us, and we have the chance to win the game and fight to reach the highest position we can.
“We’ve had too many draws. For sure we can lose 11 games in this moment, but we could win more games. Sometimes I think what I could do better to win more games, but it’s tough because we drew a lot, shooting a lot of times on goal without scoring, especially at home.”
Huddersfield all but relegated from Championship while League Two play-off spots decided
Huddersfield Town saw their relegation from the Championship all but confirmed after a 1-1 draw with fellow strugglers Birmingham City on Saturday.
The Terriers avoided a defeat that would have seen them relegated on Saturday, but even a win on the final day over promotion hopefuls Ipswich Town will not be enough unless they overcome a huge goal difference of 15 goals with Plymouth Argyle.
Birmingham remain in the other relegation place and now must beat Norwich City to stand a chance of staying up with Sheffield Wednesday, Plymouth and Blackburn Rovers also still in danger.
At the other end of the table, the Canaries dropped points in a 2-2 draw with Swansea City, leaving the door open for Hull City, who face Ipswich Town later today.
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