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.
Slot pursuit shows Liverpool running out of options, suggests Carragher
Liverpool's pursuit of Feyenoord boss Arne Slot proves there is "a dearth" of elite coaches currently on the market, according to former Reds defender Jamie Carragher.
On Wednesday, widespread reports claimed Liverpool have entered talks with Feyenoord, who will reportedly demand at least €10million (£8.5m) in compensation to part with Slot.
Slot joined Feyenoord in July 2021 after leaving AZ Alkmaar, leading the Eredivisie giants to the Europa Conference League final – which they lost to Roma – in his first campaign at the helm.
The club's second league title in 20 years followed in 2022-23, and though Feyenoord are set to relinquish their crown to PSV this term, they beat NEC Nijmegen to lift the KNVB Cup on Sunday.
Xabi Alonso was thought to be Liverpool's primary target to replace outgoing boss Jurgen Klopp, but the former midfielder – who was also interesting Bayern Munich – has announced his intention to stay with Bayer Leverkusen.
Sporting CP's Ruben Amorim was also linked with the post, but it is thought he is no longer a leading candidate.
Speaking in his role as a Sky Sports pundit ahead of Wednesday's Merseyside derby between Liverpool and Everton, Carragher warned the job will be a major step up for Slot if he is appointed.
"What I would say is I think going from Feyenoord to Liverpool is a huge jump, and I think it shows at this moment that there's probably a dearth of real top managers out there," he said.
"Initially it was Xabi Alonso, it's only his first full season as a manager. Then there was talk of Ruben Amorim from Sporting, again he's only 39. Now Arne Slot looks like he's the favourite.
"I don't think it's like Rafael Benitez coming in, or Jurgen Klopp. Benitez came in off the back of two LaLiga titles and a UEFA Cup, Klopp had won a couple of league titles with Borussia Dortmund.
"Liverpool were in a different space back then, certainly the team I was part of with Benitez… we were a team looking to qualify for the top four. It was the same when Klopp came in.
"Liverpool are in a different area now, fancying themselves to challenge for the Premier League every season, and in next season's Champions League they'd expect to reach the quarter-finals at least.
"I think it's a huge jump but he's obviously a great coach with a great track record with the clubs he's been at so far. We'll see."
PSG close in on Ligue 1 title with 4-1 win at Lorient
Paris Saint-Germain closed in on a record-extending 12th Ligue 1 title as Ousmane Dembele and Kylian Mbappe each scored twice in a 4-1 away victory against second-from-bottom Lorient on Wednesday.
Luis Enrique's side will seal the title later on Wednesday if second-placed Monaco fail to beat Lille at home.
PSG are on 69 points with four games left with Monaco trailing by 14 points.
PSG were without the in-form Bradley Barcola, Marquinhos, Achraf Hakimi, Vitinha and Warren Zaire-Emery who were rested a week before the team's Champions League semi-final first leg against Borussia Dortmund.
The capital side went ahead on 19 minutes as Dembele beat two defenders before slotting the ball past Yvon Mvogo from just inside the box.
Three minutes later, Mbappe connected with a Nuno Mendes cross to double the advantage.
Dembele then put the result beyond doubt on the hour mark when he tapped in from Mbappe's cross.
Mohamed Bamba reduced the arrears in the 73rd minute, but it was too little, too late for a team with 26 points from 30 games.
Mbappe added another one in the last minute with a right-footed effort to take his season tally in the top flight to 26.
Premier League title race gets Man City's blood pumping - Guardiola
Pep Guardiola relishes the decisiveness of the Premier League run-in, as Manchester City prepare for another huge game in the title race.
The Citizens breezed past Luton Town 5-1 at the Etihad Stadium in their last outing in the competition, but were not in Premier League action at the weekend.
While they booked a place in the FA Cup final with a 1-0 win against Chelsea on Saturday, Arsenal went back to the summit by recording wins over Wolves and the Blues before Liverpool also leapfrogged Guardiola’s team with a 3-1 victory at Fulham on Sunday.
City, who will be without the injured Erling Haaland, face Brighton on Thursday, in what is one of their two games in hand on the Gunners.
Asked how he feels going into the final few games of the season with so much on the line, Guardiola said: “Every game is adrenalin. Every game is important. But yes it’s decisive. Every mistake or every step back makes it more difficult. It is what it is.
“We have been here in the last years fortunately many times so that’s why we know what we are playing for.”
Guardiola was also questioned about the criticism levelled at match officials after Nottingham Forest’s strongly worded statement following their 2-0 defeat at Everton on Sunday.
"Absolutely disagree. In every league in the world, this kind of thing will happen more and more, but of course, I never had doubts about that,” said Guardiola.
"They make a mistake, they feel bad. It's normal. When they do the job, they want to do it well. The game is so difficult, it is fast and quick, decisions have to be made in one instant. It's not easy.”
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