Luciano Spalletti acknowledged Napoli's 4-1 Champions League hammering of Liverpool will cause a "stir" as he urged his players to deliver again after laying down a benchmark.

Goals from Piotr Zielinski, Andre-Frank Zambo Anguissa and Giovanni Simeone sent Napoli in 3-0 up at half-time, though it could have been four if Victor Osimhen's penalty was not saved by Alisson.

That marked just the fourth occasion Liverpool have found themselves three goals down at the interval in the Champions League, with Zielinski adding a fourth soon after the break.

Luis Diaz curled in a fine curling effort to reduce the deficit, but the Reds never recovered from a toothless showing as they fell to their joint-heaviest defeat in the competition.

Napoli are also unbeaten in their last nine Champions League home matches (W6 D3), scoring 20 goals and conceding just five in this spell – which includes three wins over Liverpool.

With an impressive showing in UEFA's flagship club competition, Spalletti suggested his side have placed a marker for their performances and must seize the initiative after a memorable victory.

"It is an important result because the measures are always taken based on who the opponent is, and they are called Liverpool so the result will cause a bit of a stir," coach Spalletti told Amazon Prime Video.

"What becomes fundamental is to play the football we know how to do and follow it up for 95 minutes, without going in flashes, that highlights the level of personality."

Asked if the victory served as a lesson for what Napoli could achieve, Spalletti added: "No lessons, no presumption, no arrogance.

"When you play for Napoli you have to do this every day. We played a good game, now let's think about Spezia."

Napoli will look to capitalise on the impetus from their victory over Liverpool when they host Spezia on Saturday before facing Rangers, who were smashed 4-0 by Ajax in Wednesday's other Group A game.

Barcelona coach Xavi is overjoyed by Robert Lewandowski's start at the club, referring to him as "insatiable" after terrorising Viktoria Plzen.

The 34-year-old was in ruthless form on Wednesday, scoring a hat-trick as Barca thrashed their visitors 5-1 at Camp Nou.

Playing his first Champions League game for Barca, Lewandowski netted two sumptuous 20-yard strikes either side of a stooping header, with the hosts comfortable throughout.

Wednesday's treble ensured Lewandowski became the first player to net a Champions League hat-trick for three clubs, having scored four for Bayern Munich and one with Borussia Dortmund.

But Lewandowski's display was not a real shock given his strong start to life in LaLiga, and everything about his first few weeks at Barca has left Xavi amazed.

"Robert is like that, he's insatiable. I'm delighted with how he trains, how he improves the team," Xavi told Movistar.

"He's humble, he expects [of his team-mates] and he does a great job of pressing.

"It's not just the hat-trick anymore, it's his work and how he dominates."

Lewandowski was not the only Barca player to impress, however – had the Pole not scored a hat-trick, most would have seen Ousmane Dembele as the standout performer.

The France international was dazzling at times on the right flank.

It was only the second time in a Barcelona shirt that Dembele has laid on five key passes in a single game, and two of those resulted in assists.

Dembele was in devastating form in the second half of last season, and Xavi feels the winger is having fun at Camp Nou.

"He is happy, enjoying himself," the coach added. "He is a player who makes a difference – he assists and scores goals. He is a dagger down the wing."

Barcelona's three first-half goals on Wednesday ensured they have already scored more than the two they managed in the whole group stage last term.

But a tricky trip to face Bayern Munich at the Allianz Arena awaits next week.

Antoine Griezmann declared he will "give everything" in his limited minutes after playing the role of super sub in Atletico Madrid's remarkable 2-1 Champions League win over Porto on Wednesday. 

After 100 minutes and 21 seconds, Griezmann nodded home the latest Champions League goal on record (excluding extra-time) to guide Los Colchoneros to a dramatic victory.

Mario Hermoso had broken the deadlock in the 91st minute before conceding a penalty that was scored by Matheus Uribe, meaning Atleti's win over Porto is just the second Champions League match to ever feature three goals scored after the 90th minute (excluding extra-time).

In a remarkable turn of fate, the previous instance was when these two sides met last December, when Diego Simeone's men ran out 3-1 winners in Portugal.

Griezmann has had to settle for the role of impact substitute this term, with Simeone recently hinting the France forward's minutes were being managed to avoid activating a purchase clause in his loan deal.

But Griezmann insists he is content at Atleti, telling Movistar: "It is what it is, it is not in my hands. I just thank god I'm here. 

"My family is happy, of course I want more, but I'm going to give everything in the minutes I have. 

"I'm very happy here, the only thing I want is to play here and give everything for the club, for Cholo [Simeone] and the fans.

"As I said, on my return I was going to give everything. Scoring the winning goal is always very nice, but we keep the three points and can continue like this.

"We still have a hard time finding a performance, but there are only five games [gone]. We have to improve, we are working on it in training, it is missing in the games. 

"Perhaps we lack confidence in ourselves, to pass forward, look for the strikers and it's only the fifth game, I'm sure we'll go further.

"With the red [for Porto attacker Mehdi Taremi] we got higher, we put more players up, finding passing lines, trying to get inside.

"The penalty, I don't know if it is, but it is what it is. The corner in that last play… here, until the last second anything can happen, and we repeated the Porto goal from last season."

Griezmann's winner ended a run of eight home Champions League games without a win for Atleti – the longest such sequence ever recorded by a Spanish club.

Atletico Madrid and Porto played out an eventful stoppage-time on Wednesday, becoming just the second Champions League match to see three goals scored in the 90th minute or later.

The LaLiga side took the lead in the 91st minute through Mario Hermoso, who then handled in the box as Porto looked to have snatched a point when Mateus Uribe fired home the resulting penalty.

However, substitute Antoine Griezmann nodded in a stunning winner in the 11th minute of stoppage-time to send the home fans into raptures and give his side three points.

Griezmann's goal made the Champions League game only the second to feature three 90th-minute goals, after a match between the same two teams in December of last year, when Atletico ran out 3-1 winners.

The LaLiga side's late victory gets them off to a great start as they look to go further than they managed in last season's competition when they were knocked out at the quarter-final stage by Manchester City.

Porto will have to pick themselves up as they attempt to reach the knockout stages, with Club Brugge defeating Bayer Leverkusen 1-0 in the other Group B clash on matchday one.

Jurgen Klopp conceded Liverpool must "reinvent" themselves after their underwhelming start to the season continued with a 4-1 hammering at Napoli in the Champions League.

Liverpool trailed by three goals at half-time for just the fourth time in their Champions League history after strikes from Piotr Zielinski, Andre-Frank Zambo Anguissa and Giovanni Simeone on Wednesday.

Victor Osimhen also missed a first-half penalty after another slow start from Liverpool, who have conceded first in five games this season in all competitions, the joint-most of any Premier League side.

Zielinski added a second strike after the interval, with Luis Diaz scoring a consolation goal as Liverpool fell to their joint-heaviest defeat in the Champions League.

An abject showing in Naples, coupled with just two wins in six Premier League games, left manager Klopp questioning whether Liverpool need to reshape to tackle a challenging start.

"Really tough to take, it's not that difficult to explain when you watched the game. To start with the two penalties, okay first of all Napoli played a really good game, we didn't, that is the first explanation for the defeat," the German told BT Sport.

"They scored one penalty and missed another but the next two goals we served on a plate, that's not cool and we should defend better. Then 3-0 down having chances but never really in the game.

"We were not compact defensively or offensively. Until Thiago [Alcantara] entered the pitch I cannot remember one counter-pressing situation, we were too wide.

"Everything is obvious but why it happened is now the question, I cannot answer now, let me think about it. It is a really tough cookie to take, but I have to take it.

"We played bad first halves, unfortunately, usually we don't concede three, though – with Alisson in the goal you have to be really bad to do it. We did the same here when we lost 2-0 [in 2019-20].

"It looks like we have to reinvent ourselves, there's a lot of things lacking – not in all games – but the fun part is we have do that in the middle of a Premier League season and Champions League campaign."

Wolves are next up for Liverpool at Anfield on Saturday, and Klopp suggested Bruno Lage's side will be relishing playing the Reds amid a poor run of form.

"In three days we play against Wolves, if they saw the game tonight they cannot stop laughing probably, I would say it is the perfect moment [to play us]," he added.

"We have to find a setup to be much better in everything. You could see it on the pitch, we were not working as a team, nothing to do with personal stuff, but we didn't play good enough it is obvious and clear.

"We play in the strongest league in the world and have a tough Champions League group, but it is my responsibility and I need time to think about. 

"There a few things that are obvious but it is my job to find out more to reset and go."

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.

Robert Lewandowski made history with his maiden hat-trick for Barcelona against Viktoria Plzen, becoming the first player to hit Champions League trebles for three different sides.

The Poland international found the target twice in the first half at Camp Nou on Wednesday, with Franck Kessie and Plzen's Jan Sykora also netting in a frantic opening 45 minutes.

Lewandowski capped a scintillating performance with his third after 67 minutes, firing a 20-yard finish past Jindrich Stanek after a neat interchange with Ferran Torres, who then struck to seal a 5-1 victory for Barca.

The latter strike for Lewandowski made him the first player to ever score Champions League hat-tricks for three different teams, having previously hit trebles for Bayern Munich (four) and Borussia Dortmund (one).

Lewandowski was level on Champions League goals with Karim Benzema (86) heading into the game but moved to third in the all-time scoring charts – only Lionel Messi (125) and Cristiano Ronaldo (140) have more.

The Barca forward has been in fine LaLiga form as well, scoring five times in four league appearances, and will look to continue his scoring run when the Blaugrana visit Cadiz on Saturday.

Antoine Griezmann stepped off the bench to guide Atletico Madrid to a remarkable 2-1 win over 10-man Porto in the Champions League, in a match that featured three stoppage-time goals.

Atleti and Porto played out a goalless draw when they met on the opening matchday of last season's Champions League, and a repeat looked likely for the duration of normal time on Wednesday.

But after Mehdi Taremi picked up a second yellow card for simulation, Mario Hermoso fired Atleti ahead before handling in his own area, allowing Mateus Uribe to level the scores with a 96th-minute penalty.

There was to be one final twist in the 11th minute of added time, however, as Griezmann reacted quickest from an Atleti corner to cap a remarkable contest with a dramatic winner.

Bayern Munich defeated Inter 2-0 at San Siro in their Champions League opener thanks to a first-half strike from Leroy Sane and Danilo D'Ambrosio's own goal.

The visitors dominated the opening stages and deservedly went ahead through Sane when he brilliantly brought down a Joshua Kimmich long ball, before rounding Andre Onana and drilling home.

Julian Nagelsmann's side came under increasing Inter pressure in the second half, but D'Ambrosio's awkward attempt at a block from a Sane shot killed the game off and earned Bayern all three points.

Bayern have now won their last 19 Champions League openers, as the Bundesliga titans paved the way for what they hope will be qualification from a tough Group C.

Robert Lewandowski scored his first Barcelona hat-trick as the Blaugrana met expectations with a dominant 5-1 win over Viktoria Plzen to open their Champions League campaign.

Barca's three first-half goals were more than they managed over the whole group stage last season (two) when they were dumped into the Europa League, though sterner challenges await.

Plzen had moments against an unconvincing Barca defence, with Jan Sykora netting just before the break, but the hosts were already ahead thanks to Franck Kessie and Lewandowski, who made it 3-1 on the stroke of half-time.

Although the tempo slowed slightly, Barca remained dominant after the break and Lewandowski ensured he became the first player to net a Champions League hat-trick with three different teams before Ferran Torres got in on the act.

Barca deservedly went in front early when Jules Kounde's header from a corner set up Kessie to nod in on his first start for the club.

Plzen looked set to level when Andreas Christensen clumsily tripped Jhon Mosquera in the box, but a foul on the Dane was spotted following a VAR review.

That reprieve was added to soon after as Lewandowski ruthlessly found the bottom-right corner from 20 yards.

Plzen at least appeared to be going into the break within touching distance thanks to Sykora converting from close range, but the excellent Ousmane Dembele teed up a stooping Lewandowski header to swiftly restore the two-goal lead.

Ansu Fati surprisingly sliced well wide in the first minute of a second half that was significantly less intense, but his wastefulness mattered little.

Lewandowski increased the deficit and cap his hat-trick with another sumptuous 20-yard finish after a neat interchange with Torres.

The Spain winger then rounded things off with a thumping strike from Dembele's cross.

What does it mean? Barca starting to right wrongs

Barcelona's Champions League campaign last season was dreadful – while they were paired with Bayern Munich in the group, they also finished below Benfica. Dynamo Kiev were the only team they beat.

Granted, their group this season is even tougher given Bayern and Inter are the other two teams Barca will face, but this was clearly a much greater showing than they produced against anyone in 2021-22. This was not a season-defining showing by any stretch, but the fact Barca made it look so straightforward at least shows progress.

Dembele ouses class

Lewandowski will obviously hog most headlines with his exceptional treble, but Dembele was still the best player on the pitch.

His five key passes – and two assists – were match highs, but he was just an absolute terror in general. A tremendous display.

Fati finding his feet

Xavi has been patient with Fati this season following his injury woes. This was his first start of the campaign and there was certainly some rustiness on show, as one might expect.

None of his four shots were on target, though Barca will be happy to see him come through the game unscathed, and he was lively in the first half.

What's next?

Barca go to Bayern next Tuesday as Lewandowski returns to the Allianz Arena, while Plzen will host Inter the same day.

Piotr Zielinski struck twice and assisted another as Liverpool's poor start to the season continued with a humbling 4-1 defeat at Napoli in their Champions League opener.

Jurgen Klopp's side have underwhelmed in their first six Premier League games, winning just twice, and were behind after only five minutes in Naples following Zielinski's penalty.

Alisson denied Victor Osimhen's spot-kick just 13 minutes later, but Napoli were 3-0 up at half-time after strikes from Andre-Frank Zambo Anguissa and Giovanni Simeone, the latter on his Champions League debut.

Zielinski finished past Alisson again after the interval before Luiz Diaz responded with a bending effort – a mere consolation goal for Liverpool in the Group A encounter.

Osimhen rounded Alisson before striking the post with just a minute played, but Napoli were soon ahead after James Milner handled Zielinski's effort inside the area.

Zielinski found the bottom-left corner from the resulting penalty and another spot-kick arrived soon after when VAR sent referee Carlos del Cerro Grande to check a Virgil van Dijk foul on Osimhen, who was then denied by Alisson diving to his right.

Van Dijk cleared off the line with the goal gaping for Khvicha Kvaratskhelia but Napoli doubled their lead when Zielinski teed up Anguissa, who fired under the onrushing Alisson.

Alex Meret tipped away a goal-bound Van Dijk header before Simeone, on for the injured Osimhen, turned Kvaratskhelia's driven cross into an empty net on the stroke of half-time.

Zielinski doubled his account just two minutes after the break, dinking over Alisson on the rebound following Simeone's pass, before Diaz curled into the bottom-right corner after Andy Robertson's offload.

Meret pushed a powerful Diaz header over from Trent Alexander-Arnold's cross but Liverpool were unable to recover after a toothless first-half showing.

What does it mean? Liverpool's group-stage run ends as Napoli struggles continue

Liverpool cruised to six wins from as many group-stage games in last year's competition but their attempts to become the first English side to win seven straight such matches ended abruptly.

The Reds have conceded the first goal in five games in all competitions this season, the joint-most of any Premier League side, and were never going to recover after finding themselves three down at half-time in the Champions League for just a fourth time.

Liverpool's third Champions League defeat at Napoli in the last five seasons leaves Group A wide open after the first matchday, in which Ajax smashed Rangers 4-0 in Wednesday's other game.

Kvaratskhelia leaves Trent spinning

Klopp heaped praise on Luciano Spalletti's "interesting project" before the clash and pinpointed Zielinski as the main threat – and the midfielder responded with two goals and an assist.

But Kvaratskhelia should also take the plaudits after regularly tormenting Alexander-Arnold, creating a team-high three chances – one of those the assist for Simeone's goal – before his 57th-minute removal.

Van Dijk dives in

Van Dijk epitomises Klopp's revolution at Liverpool, with his calmness and authority in defence characterising the dominant Reds, but his performances have left much to be desired in recent weeks.

The centre-back fouled Osimhen for the second spot-kick, the second penalty he has conceded in his last seven appearances for the Reds. He had previously not given one away in 150 games in all competitions.

What's next?

Liverpool will aim to recover when they return to Premier League action at home to Wolves on Saturday, while Napoli host Spezia in Serie A on the same day.

Rangers' players "let a lot of people down" with their performance in Wednesday's heavy Champions League defeat to Ajax, according to midfielder Ryan Jack.

Giovanni van Bronckhorst's side were on the end of a 4-0 loss in Amsterdam, four days on from going down to rivals Celtic by the same scoreline in the Scottish Premiership.

Ajax were three ahead inside 33 minutes thanks to goals from Edson Alvarez, Steven Berghuis and Mohammed Kudus, which Steven Bergwijn later added to.

That is the earliest Ajax have ever led by three goals in a Champions League game as they beat Rangers for a fifth time in five meetings in all competitions.

Jack was at fault for the fourth of the hosts' goals, with a terrible pass being intercepted, and accepts his side were simply not good enough at Johan Cruijff ArenA.

"We have let a lot of people down tonight," he told BT Sport. "We apologise to the fans who sacrificed to make this trip and support us. 

"We don't have time to feel sorry for ourselves. The games are coming thick and fast and we have to pick ourselves up, stick together and go again.

"Obviously everyone's disappointed. All we can do is pick ourselves up because we have a massive game away to Aberdeen. 

"We know how tough a venue that will be, so on the back of the two 4-0 defeats it's important we pick ourselves up."

Rangers had seven of their 11 starters from May's Europa League final loss to Eintracht Frankfurt, but Van Bronckhorst made a triple change at half-time.

That led to an improved second-half showing, albeit with Ajax taking their foot off the gas prior to Bergwijn's late fourth.

Reflecting on a third defeat in 12 matches this season, Van Bronckhorst said: "The performance wasn't good. The players are committed. They want to fight and work hard. 

"But against an opponent like Ajax when you're not as organised as you should be it's going to be tough.

"You don't want to give space away against Ajax. We gave less space away in the second half because we played a little bit more defensively. 

"We should have stayed more in our zones in the first half. We didn't do that so well and, as I said, every mistake is punished."

Ajax reached the last-16 stage last season and have now won each of their past four group matches in the competition, their best-such run since December 1995 (also four).

"This was a beautiful evening for us," Ajax playmaker Dusan Tadic told RTL7. "It was a great win in front of our fans. The team spirit was very good. 

"There was a lot of movement in the squad and we often put pressure on Rangers. We played very well and managed to show our own football. 

"I played in a new position for the third game in a row, and there is always room for improvement, but I have played for the team and I am very happy with this victory."

UEFA has launched an investigation into alleged "discriminatory behaviour" from Juventus supporters during their Champions League loss to Paris Saint-Germain on Tuesday.

A Kylian Mbappe brace condemned Juventus to defeat in their Champions League opener at the Parc des Princes, with Weston McKennie scoring a second-half consolation for the Bianconeri.

After the match, video footage was circulated on social media which appeared to show visiting fans making offensive gestures, prompting an inquiry. 

A UEFA statement released on Wednesday read: "In accordance with Article 31(4) of the UEFA Disciplinary Regulations, a UEFA Ethics and Disciplinary Inspector has been appointed to conduct a disciplinary investigation regarding allegations of discriminatory behaviour by Juventus supporters at the 2022/23 UEFA Champions League group stage match between Paris Saint-Germain and Juventus played on 6 September in France.

"Information on this matter will be made available in due course."

Juventus are set to host the reverse fixture on November 2.

Ajax blew away Rangers with three first-half goals as the Dutch giants kicked off their Champions League campaign with a resounding 4-0 victory in Amsterdam on Wednesday.

Edson Alvarez, Steven Berghuis and Mohammed Kudus were all on target inside 33 minutes, with that Ajax's earliest three-goal lead in the competition's history.

Rangers, also beaten 4-0 by rivals Celtic at the weekend, made a triple substitution at the break but Ajax showed no remorse and added a late fourth through Steven Bergwijn.

Ajax were dominant from the first whistle and there was a sense of inevitably about their opener when an unmarked Alvarez headed in Dusan Tadic's in-swinging corner.

Berghuis added a somewhat fortunate second for Ajax, the Netherlands winger's strike taking a big deflection off James Sands on its way past Jon McLaughlin.

A quickfire third followed as Kudus was allowed to charge into the box and fire a stunning shot across McLaughlin and into the top-far corner.

Rangers had a Borna Barisic strike chalked off for offside, and Ajax only added to their opponents' pain thanks to Bergwijn's finish following a terrible pass from Ryan Jack.

Karim Benzema is a doubt for Real Madrid's upcoming showdown with Atletico Madrid as a result of the thigh injury sustained against Celtic.

The France international hobbled off midway through the first half in Madrid's 3-0 Champions League win in Glasgow on Tuesday.

Benzema, who was considered a doubt before the game, appeared to sustain the damage – originally thought to be to his knee – when playing a pass.

Speaking after the match, Carlo Ancelotti said the injury "does not seem like anything serious", but added Madrid would await the results of a second scan.

That second scan took place at Real's Valdebebas training base on Wednesday, and it was confirmed the 34-year-old has sustained a minor muscular problem.

A statement on Madrid's website read: "Benzema has been diagnosed with an injury to the semitendinosus muscle and an overload on the quadriceps, both in the right thigh."

While no official timeframe has been given for Benzema's lay-off, reports suggest he will miss between seven-to-10 days.

Madrid host Real Mallorca and RB Leipzig over the next week, in LaLiga and the Champions League respectively, before travelling to city rivals Atletico on September 18.

Losing Benzema for any period of time will be considered a blow for Ancelotti, with his star striker having scored four goals and assisted one more in six outings this season.

He has scored and assisted 68 goals in all competitions since the start of last season – a tally bettered only by Paris Saint-Germain's Kylian Mbappe across Europe's top five leagues.