Substitute Ferran Torres snatched the only goal of the game as Barcelona extended their 100 per cent start in Champions League Group H with a hard-fought 1-0 win in Porto.
The hosts had most of the chances but were undone by a blunder from Romario Baro in first-half injury time which allowed Torres to go through and slide the ball past Diogo Costa.
It was not all plain sailing for the visitors, who had to survive a torrid late spell which culminated in Gavi being sent off in injury time for a second yellow card.
On a history-making night for Barca, Xavi named Lamine Yamal in his line-up, making him the youngest starter in Champions League history at 16 years and 83 days old, beating the previous record held by Celestine Babayaro.
The teenager provided plenty of threat in the visitors’ front line, as did former Benfica star Joao Felix, who was given a tasty reception on his return to Portugal.
Baro should have done better with a Joao Mario cross in the seventh minute but failed to get his shot off in the box, then Pepe’s touch also let him down after being fed by the dangerous Mehdi Taremi.
Barca keeper Marc-Andre Ter Stegen comfortably gathered a tame effort from Stephen Eustaquio and it was not until the 23rd minute that the visitors fashioned a real chance when the ball fell to Felix on the edge of the box but he fired just over.
Robert Lewandowski’s night was ended by an apparent ankle injury on the half-hour mark and he was replaced by Torres, but it was still Porto who threatened with Wendell in particular posing problems down the left flank.
But Baro undid all Porto’s good work on the stroke of half-time, when his blunder allowed Ilkay Gundogan to intercept and he raced clear and fed Torres, who did the rest.
Barca came close to extending their lead early in the first half when Yamal poked a shot on the turn at Costa, then Felix almost sprang onto a Torres through-ball.
But the visitors were grateful to Jules Kounde on 54 minutes after the defender got a foot in to deny what looked like a certain equaliser after Pepe had been sent through on Ter Stegen.
As the game strayed beyond the hour mark, Taremi and Wendell had half-chances for the hosts, who also had a strong penalty claim rejected by VAR after Joao Cancelo appeared to handle in the box.
Porto continued to press and Taremi had the ball in the net in the 83rd from a sublime overhead kick but was ruled clearly offside.
In a torrid final few minutes Gavi was dismissed before Francisco Conceicao twice came close to an elusive equaliser.
Allegri says Juventus future will become clear in next two weeks
Juventus coach Massimiliano Allegri said questions regarding his future will be resolved in the next couple of weeks after the Bianconeri's slump continued with Sunday's 1-1 draw with Salernitana.
Juve looked set for a humiliating Serie A loss at home to Stefano Colantuono's already-relegated side, only for Adrien Rabiot to equalise in stoppage time.
It was a fifth straight league draw for Allegri's side, who have slipped to fourth in Serie A, seven points behind second-placed Milan and level with Bologna in third.
Juve were neck-and-neck with recently crowned Scudetto winners Inter at the turn of the year, and their dismal end to the season has seen Allegri's position called into question.
Asked about his future on Sunday, Allegri said: "Just be patient a little bit longer, in 10 to 15 days you'll know what will happen next year.
"Anyone who has played football knows that even the great teams can experience a moment of difficulty when the games become tough. We will certainly have to grow."
Wednesday's Coppa Italia final against in-form Atalanta presents an opportunity for redemption.
"The final against a team like Atalanta that has grown a lot will certainly be balanced," Allegri said. "It's a one-off game and we will have to try to make as few mistakes as possible.
Regarding Sunday's match, the 56-year-old said the performance was not satisfactory but stressed the importance of avoiding defeat.
"We started reasonably well, then made a mistake in our decision-making. We became disjointed and we didn't hold our positions," he said.
"You can't lose a match like that, otherwise you risk never picking yourselves back up again."
Atalanta not favourites for Coppa Italia final against Juventus, insists Gasperini
Atalanta do not consider themselves favourites for Wednesday's Coppa Italia final against Juventus despite their strong form, says coach Gian Piero Gasperini.
Atalanta have enjoyed a fantastic season, reaching the Europa League final – where they will face unbeaten Bundesliga champions Bayer Leverkusen on May 22 – and the Coppa Italia showpiece.
La Dea are also in the driving seat to secure Italy's fifth Champions League place for next season, after Sunday's 2-1 home win over Roma took them three points clear of the Giallorossi with a game in hand.
On Wednesday, an out-of-form Juve side await Atalanta at the Stadio Olimpico, as Gasperini seeks his first trophy with the club he joined back in 2016.
"I think it's a bit much to suggest we'd be favourites against Juve. We are in good form, but it's difficult to tell playing every three days," Gasperini told DAZN on Sunday.
"Naturally, we go into this Coppa Italia final with great enthusiasm."
Atalanta's Milan loanee Charles De Ketelaere produced another fine performance against Roma, scoring twice inside 20 minutes.
With 13 goals and nine assists, he is one of three Atalanta players to record 22 goal involvements in all competitions this season, alongside Gianluca Scamacca (17 goals, five assists) and Teun Koopmeiners (15 goals, seven assists).
Manchester City and Leverkusen (four apiece) are the only teams in Europe's top five leagues with more players with at least 22 direct goal involvements.
"Everyone knew he could play, or Milan would not have made an investment like that. He deserves the credit, he was going all over the place, right, left and centre tonight," Gasperini said of De Ketelaere.
Lorenzo Pellegrini reduced the deficit for the visitors with a penalty after 66 minutes, but overall Atalanta were dominant.
While Gasperini was happy with the win, he did not enjoy the wastefulness of his side.
"I don't know if we've learned a lesson, other than we had so many scoring opportunities and did not aim properly, otherwise we would have killed it off a lot earlier," he said.
"Failing to win this match really would have caused us a lot of problems."
'Not a good sign' – Keane unimpressed by Man Utd's injured absentees
Roy Keane was left questioning the attitudes of Manchester United's players as the Red Devils were once again without numerous key players for Sunday's loss to Arsenal.
Bruno Fernandes, Marcus Rashford and Lisandro Martinez were among the notable names to miss out for the 1-0 defeat at Old Trafford, as Erik ten Hag bemoaned continued injury issues.
Martinez and Harry Maguire's absence ensured Ten Hag had to field Jonny Evans and makeshift centre-back partner Casemiro in defence, with the latter at fault for Leandro Trossard's winning goal.
Wayne Rooney vocalised his concerns over the application of United's players and Keane, speaking on Sky Sports, echoed his thoughts as he questioned the prolonged absence of some.
"Obviously, that's not a good sign," Keane said of players not returning from injury. "You'd hope players who are carrying injuries are desperate to get back playing again.
"There is always a worry, there are always players at every club that can drag their heels with an injury.
"Generally, players I played with when they were given a period they'd be injured for, they were always trying to knock a week off it and get back playing for Manchester United or whatever club they're at."
Without a host of key players, United have conceded in 10 successive games in all competitions for the first time since October 2021.
The Red Devils' 82 goals they have conceded this season is their most since 1970-71 (also 82), too, as United continue to disappoint in the 2023-23 campaign.
United have also lost 19 games in all competitions this season, their most since 1977-78 (also 19), while their nine defeats at Old Trafford this term are their joint-most at home in a single campaign.
Keane says the concerns over players not racing back to fitness is not unusual, though it does little to aid Ten Hag's plight.
"It's always a worry but I have to say, it goes on at lots of football clubs," the United great said.
"There are lots of players out there when they have an injury, they're not in the hurry to get back in the team. I think that's obvious and happens at lots of football clubs."
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