Much has changed in European football in the past five years – and few clubs illustrate that greater than fallen giants Barcelona.
On this day in 2017, Barca were thrashing Paris Saint-Germain 6-1 in the most remarkable Champions League turnaround ever, becoming the only side in the competition's history to overturn a four-goal first-leg deficit.
Now, Neymar and Lionel Messi – the two stars of that Blaugrana side – are preparing to play Real Madrid as PSG players.
Meanwhile, Barca are not even in the Champions League knockout stages, instead facing Galatasaray in the Europa League last 16 while battling to return to UEFA's flagship competition next season.
Indeed, Barca's recent European past has found them on the wrong end of epic Champions League comebacks, but that PSG classic still ranks among the tournament's greatest two-legged recoveries – remembered by Stats Perform here...
2019: Liverpool 4-0 Barcelona (4-3 on aggregate)
One of a couple of examples Barca fans will not remember so fondly, Jurgen Klopp's Liverpool had been well beaten at Camp Nou, with the 3-0 scoreline flattering the Catalans but making them clear favourites to complete their semi-final task at Anfield.
Liverpool were without injured forwards Mohamed Salah and Roberto Firmino for the second leg, yet two goals each from Divock Origi and Georginio Wijnaldum saw the hosts defy the odds in sensational style.
Origi had the final word thanks to Trent Alexander-Arnold's quick thinking from a 79th-minute corner.
It meant a Barca side boasting Messi and former Liverpool stars Philippe Coutinho and Luis Suarez were left devastated, while Klopp's men celebrated reaching the final, where they would win a sixth title.
2019: Ajax 2-3 Tottenham (3-3 agg)
The night after Liverpool's win, Ajax looked certain to join the Reds in the final when they extended their 1-0 first-leg lead to 3-0 in Amsterdam with first-half goals from Matthijs de Ligt and Ziyech.
Mauricio Pochettino's Tottenham took inspiration from Liverpool's stunning fightback 24 hours earlier, though, and Lucas Moura stepped up to emerge as their hero.
The Brazilian forward scored an improbable hat-trick in the second half, the vital third goal coming deep into stoppage time, as Spurs won on away goals.
2018: Roma 3-0 Barcelona (4-4 agg)
Barcelona were stunned in the Italian capital as Roma completed one of the most unlikely quarter-final turnarounds – another that benefited from an away goals rule that has since been scrapped.
Eusebio Di Francesco's side came back from a 4-1 first-leg deficit to progress to the last four after a thrilling 3-0 win in front of their home fans.
Edin Dzeko, Daniele De Rossi and Kostas Manolas secured the 4-4 aggregate draw and sent the Stadio Olimpico into raptures, as Barca fell to pieces.
2017: Barcelona 6-1 Paris Saint-Germain (6-5 agg)
Those humblings at the hands of Roma and Liverpool make for painful memories for those of a Blaugrana persuasion, but this remains the ultimate 'Remontada'.
Trailing 4-0 from the first leg of their last-16 tie with PSG, Suarez and Messi scored either side of a Layvin Kurzawa own goal, only for Edinson Cavani to grab what was expected to be the decisive away goal for the visitors.
However, two quickfire Neymar goals – the second a highly controversial penalty after an apparent Suarez dive – brought it back to 5-5, meaning Barca needed just one more.
Then, in the fifth minute of stoppage time, Sergi Roberto struck from Neymar's cross to create Champions League history.
2004: Deportivo La Coruna 4-0 Milan (5-4 agg)
Deportivo were among Spain's major forces just after the turn of the century and one of their finest moments in Europe came in April 2004 when, despite being 4-1 down from the first leg of their Champions League quarter-final with Milan, they stunned the Rossoneri at the Riazor.
Walter Pandiani, Juan Carlos Valeron and Albert Luque had Depor ahead on away goals before half-time, with veteran Fran Gonzalez scoring the fourth to make sure of their passage.
Depor were eliminated by eventual winners Porto in the semi-finals, but this comeback stood as arguably the very best in Champions League history until Barca went one better.
2000: Barcelona 5-1 Chelsea (aet, 6-4 agg)
Barca already had a history of Champions League fightbacks.
A 3-1 first-leg loss at Stamford Bridge – having trailed 3-0 – had the Blaugrana in danger of being on the wrong end of a major Champions League upset prior to Chelsea's Roman Abramovich era, but in the return match the Catalan giants showed their true class.
Tore Andre Flo's 60th-minute goal was sending Chelsea through despite Rivaldo and Luis Figo scoring before the break, but Dani Garcia headed home seven minutes from the end of regulation to force extra time.
Rivaldo atoned for an earlier missed penalty by converting from the spot after Celestine Babayaro was sent off, and Patrick Kluivert finished the game off, crushing Chelsea's dreams.
Carragher says Liverpool may need to move on from Salah and Nunez
Jamie Carragher believes Liverpool's next manager has a big decision to make regarding Mohamed Salah's future, adding the Reds definitely need to move on from Darwin Nunez.
Liverpool's title hopes suffered a potentially fatal blow at Goodison Park on Wednesday, as goals from Jarrad Branthwaite and Dominic Calvert-Lewin handed Everton a memorable 2-0 win.
The defeat – Liverpool's first at Goodison since 2010 – means they are three points behind Premier League leaders Arsenal and one clear of Manchester City, who have two games in hand.
Jurgen Klopp now looks likely to end his final season at the helm with just February's EFL Cup triumph to show for his efforts, with Carragher declaring Liverpool's title hopes to be over on Wednesday.
He also believes Klopp's successor – which could be Feyenoord's Arne Slot if reports are to be believed – may need to shake up Liverpool's frontline.
"Mo Salah is Liverpool's goalscorer and he's gone off the boil. That's shone a light on others," Carragher told Sky Sports.
"There is a real discussion for the new manager about what the future holds for Mo Salah – it's the first time we've asked that question. He only has a year to go on his deal.
"He's looked a shadow of himself for a lot of this season but especially since he's come back from injury. He is Liverpool's legend, superstar, one of the all-time greats, but he's been so far off it."
Salah has 17 Premier League goals this season, but 14 of those came before he went to the Africa Cup of Nations with Egypt in January.
Prior to that tournament, Salah boasted a shot conversion rate of 21.54 per cent for 2023-24, netting with 14 of his 65 total attempts in the competition. Since returning, he has only converted 8.57 per cent of his 35 efforts.
Salah's strike partner Nunez has also come in for criticism, with only Erling Haaland (30) missing more big chances than the Uruguayan's 26 this term. Haaland has, however, converted 34.78 per cent of his big chances to Nunez's 18.75 per cent.
Carragher does not believe Nunez is capable of further improvement after two up-and-down campaigns on Merseyside, saying: "I think I'm at the stage with Nunez where I'm not sure there's a question to ask.
"You want him to do well because he gives everything, he causes trouble, he gets the odd goal.
"But after two years, when Liverpool are going for the title or in big games, you need your man to score at Old Trafford or at Goodison Park. This is the business end, the time to win.
"He's ground to a halt. After two years there's going to be no improvement in him. This is what he is.
"He can cause trouble but he's erratic with his finishing – it's not enough to win you trophies so there's a big decision to be made on him. It's not acceptable when you're going for a title."
Guardiola insists Man City share same title hunger as challengers
Pep Guardiola insists Manchester City share the same hunger to lift the Premier League trophy as their title rivals, warning perfection may still be needed for the champions to retain their crown.
It has been a mixed week for City's rivals thus far, with Arsenal thrashing Chelsea 5-0 on Tuesday before Liverpool suffered a surprise 2-0 defeat in Wednesday's Merseyside derby at Everton.
Those results mean the Gunners sit four points clear of City and Liverpool lead the champions by one, but with two games in hand, the title race is still very much in City's hands.
They go to Brighton and Hove Albion on Thursday before facing Nottingham Forest on Sunday, and Guardiola still thinks even the slightest slip-up could prove costly.
Asked whether City need to win their six remaining games to win the title, Guardiola said: "Yes, absolutely. They gave us a chance, with the fact they lost last week to Aston Villa and Crystal Palace.
"But we knew what we had to do before those games, and now we have to win all games so that at the end, we have it in our hands to retain our title.
"Nothing changes. The fact is, we knew what we had to do before, and now nothing has changed."
Guardiola was then asked whether City are as motivated to win the title as their rivals, having lifted the trophy in five of their seven seasons under him to date.
He said: "I would not be here [if not]. There are so many games, and to be in this position after what we have done in the past, it would not be possible [without the desire].
"We know the difficulty is extreme, and it will remain difficult because we have tough games coming up. We go one game at a time, and we know that if we lose, it will be so tough to retain the title.
"Last Saturday proved the many difficulties we have, especially the schedule and recovery time after the game against [Real] Madrid. The players were unbelievable."
Guardiola hit out at the busy nature of the schedule after Saturday's FA Cup semi-final win over Chelsea, saying he couldn't understand how his players had managed to perform just three days after their penalty shoot-out defeat to Madrid.
Those comments have sparked renewed debate about the football calendar, and Guardiola was asked whether elite clubs had a right to complain while organising money-spinning pre-season tours around the globe.
"Yeah, but we have to do it," he said. "We have to pay the salaries of the players and the manager, and the club has fans all around the world who want to see us. They are an income for us.
"It's not easy, but we have to get resources. I would love to say don't go to another continent to play, have another week of holiday, and then train here. But we have to understand the club.
"It's not just Man City. Every club needs those financial resources to be sustainable. Now that we've won a lot, for many years, we have a lot of supporters. That's why it's necessary to do, and you have to adapt.
"But that is not the reason why [he complained]. The reason is that the schedule is so tight. I'm sorry, it's not."
Van Dijk: Liverpool have 'no chance' in title race after derby defeat
Virgil van Dijk conceded Liverpool might be out of the Premier League title race after they suffered a surprise 2-0 defeat to Everton in Wednesday's Merseyside derby.
Jarrad Branthwaite and Dominic Calvert-Lewin scored in either half to give the Toffees their first win over Liverpool at Goodison Park since 2010.
Liverpool struggled to find a way through the Toffees' defence despite dominating for long periods, and the Reds' captain says they will not outlast Arsenal and Manchester City without major improvements.
Speaking to Sky Sports, Van Dijk said: "If we play like today, then we have no chance to consider ourselves in the title race.
"We have to just focus on the next game and that will be a tough one anyway, so we will see.
"We're very disappointed, in so many ways. I think everyone has to look at their own performances. Did they really give everything, and do they really want to win the league?
"We're still fighting and there are still games after tonight, but if we play like we did overall in the game today – not winning challenges and giving the referee a chance to give free-kicks like he did many times, then you have no chance to win the title."
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