It's a clash befitting a Champions League final, yet Barcelona and Manchester United will tussle twice over the next nine days just for the right to play in the last 16 of the Europa League.
A result of United's dreadful 2021-22 season and Barca's surprising failure to get out of their Champions League group means two giants of the European game find themselves in UEFA's second-tier competition.
While that might suggest a hint of both being fallen giants, these two teams are enjoying largely promising seasons, with Thursday's first leg at Camp Nou undeniably intriguing.
Barca are on course to win LaLiga for the first time since 2019, while United have made significant strides forward following the beginning of a rebuild with new manager Erik ten Hag. A Premier League title challenge could yet come to fruition.
But the Europa League is where their attention turns now, and United's bid to reclaim the title they won in 2017 – the last trophy they lifted, in fact – has them facing arguably the toughest possible challenge straight away.
The absence of Lisandro Martinez for the first leg due to suspension will be a huge source of frustration for Ten Hag, which highlights just how effective the Argentinian has been in his first few months at the club.
United prepare to suffer
Xavi's spell in charge of Barcelona to this point has been a little difficult to draw conclusions from. That's not just what critics think; there are also many, many supporters who remain uncertain.
They routinely win games without playing particularly spectacular football, and that's essentially the crux of both sides of the debate. Some fans may not be enamoured with the brand of football, but Xavi is getting results.
Since the start of the first LaLiga matchday with Xavi at the helm, Barcelona have amassed 112 points in 47 games – Real Madrid, who've played a match less, have taken 104. That's the same Real Madrid who won a league and Champions League double last year.
Now, he has Barca well on track to win the title this season. Even if they perhaps don't have the same entertainment value as Pep Guardiola's vintage Barcelona, Xavi deserves recognition for the transformation he's overseen, part of which is shown in their work rate.
They are tireless.
Former Barca coach Quique Setien, now at Villarreal, highlighted this after his team were beaten 1-0 by them at the weekend.
"There is something that this Barca has changed a lot, which is without the ball," he said. "The data is there: Barca is the team that runs the most without the ball. Seems surprising, doesn't it? Robert Lewandowski is the first defender."
How does this translate into output? Well, their 210 high turnovers is second only to Athletic Bilbao (223) in LaLiga, while Athletic and Atletico Madrid (35 each) are the only two teams to convert such situations into shooting opportunities more often than Barca (32).
Barca's 324 pressed sequences is bettered by just Athletic (330) and Rayo Vallecano (328), though Xavi's side allow their opposition on average only 8.8 passes before a defensive action. This is a low for LaLiga.
Altogether, these metrics highlight just how hard Barca work to get the ball back when they don't have it, and as such it brings into focus the kind of defensive pressure their opponents' centre-backs are put under.
The centre-back playmaker
That is, of course, where Martinez becomes relevant. Obviously his presence would likely be felt even if Barca didn't press with such intensity, as he's arguably been United's most consistent and impressive defender this season purely from a 'putting-your-body-on-the-line-and-battling-for-the-cause' perspective.
Yet, it's his ability on the ball that makes him key for Ten Hag.
Martinez's importance to United in this respect was as evident as ever during the weekend win at Leeds United. Until his 61st-minute introduction, Ten Hag's men had struggled desperately with their hosts' intensity.
Leeds were ferocious in their pressing, and although left-back Luke Shaw generally did fine in Martinez's place at centre-back, United instantly looked like they had more time on the ball once those two were in their rightful positions.
Martinez was dropping his shoulder to evade attackers, pinging long cross-field passes out to the right. Granted, you could make the case Leeds were tiring, and that's potentially a valid argument, but Martinez's performance wasn't surprising. It's just how he's played ever since making the move from Ajax.
Although he only came on with 29 minutes left, Martinez's 35 passes was only bettered by five of his team-mates and no one on the pitch (minimum three passes) had a better completion rate (85.7 per cent).
His ability on the ball makes Martinez effective at helping United resist pressure. He has lost possession 173 times in the Premier League this season, but that is just 12.3 per cent of his total touches. Only 11 centre-backs (minimum 15 appearances) have lost the ball less frequently.
This is despite his passing being positive and forward-thinking in nature, which is evidenced by the fact only Arsenal's William Saliba (22) has initiated more shot-ending sequences than Martinez (16) in the Premier League this term.
United now go into arguably their biggest game of the season – until next week's EFL Cup final – without him, a match where his strengths will have possibly been more useful than any previous fixture.
But if there's one positive, the need to highlight his importance makes a mockery of those who rushed to write Martinez off at the start of the season.
Salah's contract 'up to him and the club', says Slot
Arne Slot has asserted Mohamed Salah’s future is “up to him and the club”.
The Liverpool star has yet to make a decision on whether to renew his contract, and as it stands, will be leaving Anfield at the end of the season.
Salah remains a key player for the Reds, and leads the club for Premier League goals (seven) and assists (five) this term.
He scored the winner in the 72nd minute to complete Liverpool’s comeback against Brighton in the Premier League on Saturday, as they moved to the top of the table.
And despite the question marks over Salah's future, Slot is not concerned.
"[His future] is not what I think about. The only thing I think about is he is so important for us. Scores important goals, works hard for the team," the Liverpool boss told TNT Sports.
"I’m hoping he can enjoy that feeling many, many, many more times. Especially if I’m here but also if I’m not here. I’m hoping he can do this many more times.
"He’s been incredible for Liverpool over the past eight years. He’s been incredible for us this season and I hope he can continue doing this for the rest of the season and maybe longer to come, but that’s up to him and the club to find the idea about the future."
Salah could be in for a historic night on Tuesday when Liverpool face Bayer Leverkusen, having scored in each of his last five Champions League appearances at Anfield.
The last player to score in six consecutive home games in the competition for an English club was Ruud van Nistelrooy for Manchester United in April 2003.
Salah sparked renewed talk over his future after posting on Instagram on Sunday, saying that the feeling of scoring at Anfield would remain unforgettable “no matter what happens.”
But Slot was keen to quash any deeper meaning in the post.
"I haven’t spoken to him about that. You interpreted it in a way that maybe other people don’t," he told the press.
"I don’t look at Instagram posts of my players, I only talk to them which you can’t, which is the advantage I have.
"Mo is in a very good place at the moment. As long as he has been at Liverpool, he has been in a very good place, but this season again as well. I am hoping he will make a post after tomorrow and on Saturday again. What he said with that, that is not important.
"For me what is important is how he plays and what he tells me when we have conversations. That is what matters and not how you guys interpret one of his posts."
Neymar suffers fresh injury blow
Neymar sustained a new injury as he was forced off during Al-Hilal's AFC Champions League Elite win over Esteghlal.
Aleksandar Mitrovic plundered a hat-trick on Monday to seal a 3-0 win.
But Al-Hilal's victory was soured by an injury to Neymar, who had to make way just 29 minutes after he came on as a second-half substitute.
The Brazilian, who has just returned from over a year out of action following a serious knee injury, was forced off with what appeared to be a thigh issue.
Indeed, Monday's appearance was only the 32-year-old's second for Al-Hilal since his comeback.
He has featured just seven times for the Saudi Pro League champions in all competitions since his big-money move from Paris Saint-Germain in 2023.
Amorim: Man Utd will think 'new Alex Ferguson has arrived' if Sporting beat Man City
Ruben Amorim joked Manchester United fans will think he is the next Alex Ferguson if Sporting CP manage to beat Manchester City in the Champions League.
The head coach has agreed to join the Red Devils and will take charge from November 11 after signing a contract with the club until the end of the 2026-27 season.
Before then, he has two games left in charge of Sporting, starting with their Champions League match against Pep Guardiola's men on Tuesday.
Sporting have made a perfect start to the Primeira Liga, winning all 10 of their games, and have made an unbeaten start in Europe, but Amorim is prepared to come under more scrutiny while on the touchline against City.
"Winning tomorrow would be brilliant. Would I be a hero at Manchester United before I land? I don't think about that, my focus is on winning the game for Sporting," Amorim told a press conference.
"The inferences that people will draw from this game are not important to me because they can be misleading. If the result was very negative, expectations will be lowered, and I don't think that is a bad starting point when I start at United.
"If we win tomorrow, they will think that the new Alex Ferguson has arrived and that will be very difficult to maintain. What interests me is to win tomorrow, to have a farewell at Alvalade, then win in Braga and then start in Manchester.
"It can increase or decrease expectations. I don't know what is better. I want to leave the fans and the players happy and confident and qualify the team for the play-offs."
Sporting won their first European meeting with City in March 2012 in the Europa League, but are winless in their last three against them (D1 L2).
However, they are unbeaten in their first three Champions League games so far this season, and if they avoid defeat on Tuesday, they will equal their longest-ever unbeaten run in the competition (four between September 1982 and March 1983).
The 39-year-old boasts the best win ratio of any Sporting coach on record in the Primeira Liga, winning 120 of his 156 such games in charge (76.92%), but captain Morten Hjulmand said the team are ready to prove they do not need Amorim, who agreed with the sentiment.
"Yes, [Sporting is prepared for his departure]. You heard Hjulmand say that they no longer need the coach," he added.
"They are very mature; they understand the game very well. They are prepared, it won't make any difference in the end.
"There is a change, of course, but the team is prepared and has enough maturity to move forward."
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