Dominik Szoboszlai levelled for Liverpool after Marcos Llorente had initially given Atletico the lead before Mac Allister fired in from outside the box to give Andoni Iraola his first win at home for Liverpool and his first Champions League victory as manager. Mac Allister had dominated the pre-match headlines after his candid press conference on Tuesday, in which the Argentinian said he was "sad" that Liverpool did not offer him a new contract over the summer. But the 27-year-old, who is contracted at Anfield until 2028, did his talking on the pitch on Wednesday with a superb left-footed strike that gave Jan Oblak no chance. With two draws and a win in the Premier League, Liverpool remain unbeaten under Iraola but for the third time in four games, they conceded first. Milos Kerkez failed to track Llorente, who got on the end of Julian Alvarez's ball and finished past Alisson to score at Anfield again. Llorente named his dog "Anfield" after scoring twice against Liverpool in 2020 when Diego Simeone's side knocked them out of the Champions League. Of Llorente's 10 Champions League goals, five have now remarkably come at Liverpool's Merseyside home. Alisson did well to deny Alvarez - who was making his first Atletico start of the season after failing to get his desired move to Barcelona - from distance and Liverpool levelled before the break after Kerkez did brilliantly to win the ball back and Ronald Araujo played a smart back-heel to tee up Szobozlai, who finished well. Shortly after half-time, Bradley Barcola - making his first Liverpool start since his £123m move from Paris St-Germain - missed a glorious opportunity when he fired wide but a minute later, Mac Allister got the winner when he got on the end of a loose ball and rifled home in front of the Kop. There was a slight scare for Liverpool when Barcola went down with cramp and the Frenchman had to be replaced on the hour mark but Iraola's side held on for a crucial three points. Liverpool's next game in the Champions League is away to LASK on October 14.

The Gunners were guilty of wasteful finishing and were heading for a frustrating draw in their first game in the Champions League since losing last season's final in agonising fashion. However, Odegaard had Arsenal's 1,500 travelling fans celebrating after a fine finish from outside the box - the captain's fourth goal in five games, including the Community Shield. Piero Hincapie dropped to his knees after the full-time whistle and thumped the ground with his hands in relief at the result. Arsenal won all eight group phase games on their way to last season's final, and they are up and running after a fine win in Italy. Mikel Arteta's side had missed three great chances to punish last season's Serie A runners-up before Odegaard's winner. There were 29 passes in the build-up to Arsenal's winner, their second-most on record (since 2003-04) for a Champions League goal (33 for Lucas Perez's second at Basel in December 2016). Mikel Merino was presented with a glorious chance to mark his first club start since January but the Spain midfielder headed straight at goalkeeper Alex Meret midway through the first half. Then Bukayo Saka looked set to break the deadlock only to lift his attempt over the bar before Hincapie blazed over from inside the six-yard area. The Gunners did endure a couple of scares most notably when David Raya spilled a shot from outside the box by Kevin de Bruyne, a Champions League winner with Manchester City in 2023. However, Ben White was quickest to react and clear the ball before the home side could pounce. Arsenal registered 26 attempts - their highest total in a single match in the Champions League since the start of last season.

The hosts fell behind in the opening five minutes as captain Goncalo Ignacio bundled goalkeeper Rui Silva's save over his own goal line. Sporting striker Luis Suarez thought he had levelled soon after when he slotted home but it was disallowed for offside. Just moments after the disallowed goal, Sporting found their equaliser with Geny Catamo pinging a half-volley into the bottom corner from 14 yards. Perhaps flattered by the level scoreline at the break, Sporting turned it on in the second half. The Portuguese side won a penalty as Suarez went around goalkeeper Ugurcan Cakir before he was clipped by Ismail Jakobs. After a long video assistant referee check to confirm the decision, Suarez planted the spot-kick into the bottom corner for the lead. Six minutes later, the points were secured by Sporting - who netted their third goal from just their fifth effort. Rodrigo Zalazar scored the pick of the bunch by curling a free-kick into the top corner from 22 yards out.

The forward opened the scoring on 20 minutes, lashing into the roof of the net from close range from Angelo Stiller's cut-back. Norwegian champions Viking had started the game well and quickly equalised, captain Zlatko Tripic slotting home two minutes later. But Bosnia-Herzegovina international Demirovic quickly restored his side's lead with a simple finish from Deniz Undav's pinpoint pass. The pair then combined again on 32 minutes with Demirovic chesting down Undav's pass and striking sweetly on the volley to net his third. There was a video assistant referee intervention with questions over whether Demirovic had handled the ball and goalkeeper Arild Ostbo will perhaps think he could have done better, but it ultimately proved enough to secure the three points. Viking were positive after the break as Stuttgart went for a more defensive approach but the visitors were unable to mount a comeback. Things will get no easier for the Stavanger-based side as they welcome German champions Bayern Munich in their first home match of the campaign next week.

Defender Tarik Muharemovic headed the opener in the third-round tie as Leeds dominated the first half before Brenden Aaronson doubled the visitors' lead shortly after the break. However, Chelsea manager Xabi Alonso's changes at the start of the second half ultimately transformed the contest. Palmer scored from the penalty spot and curled home from the edge of the area in a pivotal two-minute spell before Neto added a third. Rogers also played a key role, helping to create four goals from open play, with Danny Welbeck and Valentin Barco both benefiting. Welbeck deflected Barco's wayward strike into the net in stoppage time to add a sixth Chelsea goal, as Leeds were swept away. It was an extraordinary game, with both sides heavily rotated following their Premier League fixtures. Chelsea made nine changes, while Leeds made eight. Leeds' second-string side were the better team throughout the first half, aside from a couple of efforts from Jamie Gittens and a flicked attempt from Welbeck shortly before the break. Otherwise, Daniel Farke's side were in complete control. Aaronson and Muharemovic both had close-range efforts well saved by Chelsea goalkeeper Mike Penders in the 21st minute. Muharemovic made the breakthrough moments later, powering a header in at the far post from a corner. He then missed a similar opportunity before midfielder Sean Longstaff fired over from the edge of the area. In response, Alonso introduced Palmer, Rogers, Neto and Reece James for the second half, withdrawing 16-year-old debutant Reggie Watson, the fourth-youngest player to play for Chelsea, along with Malo Gusto, Gittens and Estevao Willian. Leeds doubled their advantage when Ethan Ampadu capitalised on Barco losing possession in midfield. His cross was cut back and flicked into Aaronson's path, allowing the American to finish, but Chelsea soon responded. The hosts were handed a lifeline when Dan James was adjudged to have fouled Pep Chavarria. Palmer swept the resulting penalty beyond Leeds debutant goalkeeper Michael Zetterer. Two minutes later, Palmer curled a shot past Zetterer after Rogers flicked on Josh Acheampong's throw-in. James then clipped a one-on-one chance just wide before Chelsea hit the front thanks to Neto. The Portugal forward slotted home on the counter-attack after being released by Palmer and Rogers. Moments before Leeds were due to make four substitutions of their own, having also rested a number of regular starters, Welbeck added a fourth Chelsea goal by turning inside the area and drilling a low shot past Zetterer. Two substitutes combined for Leeds as Dominic Calvert-Lewin guided Noah Okafor's cross into the corner, giving the visitors brief hope. However, Barco then added a fifth Chelsea goal through a powerful finish after another delivery from Rogers, before Welbeck completed the flurry of scoring just before the final whistle. Chelsea move into the fourth round, with ties to be played in late October.