Pierre-Emerick Aubameyang scored twice as Barcelona eased to a 3-1 win over 10-man Celta Vigo in a game overshadowed by Ronald Araujo leaving the field in an ambulance.
Araujo clashed heads with Gavi shortly after the hour mark at Camp Nou and, after initially appearing to run off the injury, collapsed to the floor before being attended to by medics.
That incident came shortly after Iago Aspas had struck to give Celta some hope following Memphis Depay's opener and a couple of goals from Aubameyang either side of half-time.
But a red card for former Barca loanee Jeison Murillo ultimately left the visitors, who recovered from three down to draw 3-3 in the reverse fixture, with too much to do in Tuesday's LaLiga contest.
Dembele showed superb trickery to take the ball past two opponents and pull it back for Depay to sweep past Matias Dituro, who got a hand to the shot but could not keep it out.
Marc-Andre ter Stegen, returning from illness that ruled him out last weekend, kept out Thiago Galhardo at full stretch and denied the same player from a header soon after.
Barca doubled their advantage before the interval through Aubameyang, who tucked into the bottom-right corner after Nestor Araujo failed to deal with Depay's cross into the box.
Aubameyang took advantage of some more good play from Dembele three minutes after the interval by clinically sweeping home Barca's third.
A poor pass from Ter Stegen to Araujo allowed Galhardo to pounce and play in Aspas, but Celta's momentum was halted when last man Murillo fouled Depay and was sent off.
Barcelona saw Araujo leave the field with a head injury soon after and had a fourth goal for substitute Riqui Puig ruled out for offside, but they had no trouble seeing out the win, despite 11 minutes being added on.
Juve must play at their limits against in-form Lille, warns Motta
Thiago Motta stressed the importance of Juventus playing at their very best when they face Lille in the Champions League on Tuesday.
Juve face a tough task against a side who have already upset Real Madrid and Atletico Madrid in this season's competition.
This will be the first ever meeting between these teams.
However, Juve have lost three of their last four Champions League matches against French opponents (W1), including both against Paris Saint-Germain in the 2022-23 campaign. and Motta warned against any complacency.
"All matches are important. We, as Juventus, always want to win. The most important thing is always trying to improve," Motta told reporters on Monday.
"Lille are very confident, and we want to face them in optimal condition. We aim to give more than our maximum.
"There are no favourites in a match. It's a beautiful game, in a beautiful stadium, and we hope the pitch will be in good condition tomorrow. We can only talk tomorrow about who played better."
Motta will have midfielder Douglas Luiz from injury, but is still without a glut of players.
"He's [Luiz] one more player who can help the team. We’ll be missing Arek [Arkadiusz Milik], Gleison [Bremer] and [Nicolas Gonzalez]."
Lille boss Bruno Genesio knows Juve will present a stern test for his team, despite their shock wins over the Madrid clubs this term.
"Every Champions League match is different, but there is one essential parameter to get a result - commitment," he said.
"Like all Italian teams, Juventus are very well organised, very difficult to play against. Having already achieved two big results in this competition, we are going to give it our all again and we have our fans who will give us strength."
Jonathan David will be one of the standout Lille players Juve have to keep a close eye on.
The Canada international has scored six goals in his last eight Champions League appearances for Lille.
Lille have won all five games he has scored in but have not won any of the six games he has featured in without scoring (D2 L4).
Gyokeres rated above Haaland by Sporting captain Hjulmand
Sporting CP captain Morten Hjulmand hailed his team-mate Viktor Gyokeres as a superior striker to Erling Haaland ahead of Tuesday's clash with Manchester City.
Sporting, who will lose head coach Ruben Amorim to Manchester United next week, face the Red Devils' fierce rivals in their fourth Champions League game of the season.
That contest will pit two in-form Scandinavian strikers against one another as Sweden international Gyokeres takes on Norway superstar Haaland.
Gyokeres has been a revelation since swapping Coventry City for Sporting last season, scoring 34 goals in the Portuguese top flight this calendar year.
That is more than double the figure managed by the competition's next-most prolific player, with Porto's Galeno netting 16 times.
Gyokeres' haul has come from an expected goals (xG) figure of 28.17, while his shot conversion rate of 27.9% also dwarfs that of nearest rival Galeno (19.5%) and he has scored 31 of 47 big chances in 2024.
His 61.2% big-chance conversion rate is the second-best of any player in Europe's top 10 leagues, behind Jan Kliment, who has managed a 75% ratio for Czech side Sigma Olomouc.
As Gyokeres prepares to do battle with Haaland, who has 11 goals in 10 Premier League games this term, he has received a glowing endorsement from his skipper.
Asked which striker was the better player at Monday's pre-match press conference, Hjulmand said: "Gyokeres, because he plays for Sporting."
Outgoing boss Amorim, meanwhile, knows Sporting's financial position means they will one day cash in on the Swede, who has been linked with several Premier League clubs.
"I don't know Sporting's plans, but if the right offer arrives they will have to sell," Amorim said on Monday.
"He is an athlete who is at his peak and can give a lot, both in terms of money to his club, and income to the future club".
Gyokeres already has 16 league goals for Sporting this season, the most of any player in Europe's top 10 leagues ahead of Barcelona's Robert Lewandowski, who has 14.
Haaland is tied for third place, alongside Bayern Munich's Harry Kane and Atalanta's Mateo Retegui.
Gyokeres has also been directly involved in 10 goals in 12 appearances for Sporting in European competitions (seven goals, three assists), scoring on all four of his European starts at the Estadio Jose Alvalade.
He still has some way to go to match the Champions League exploits of Haaland, though.
The City talisman has been directly involved in 49 goals in 42 appearances in the competition (44 goals, five assists).
If he scores or assists on Tuesday, he will become the fastest player to 50 goal contributions in the competition's history (43), overtaking Ruud van Nistelrooy for fewest appearances to reach that figure (45).
Arsenal sporting director Edu steps down
Arsenal have confirmed Edu has resigned from his role as the club's sporting director.
Edu, a former Arsenal player who was part of the "Invincibles" squad in the 2003-04 season, has been involved in the behind-the-scenes running of the Gunners since July 2019.
He first returned to the club as technical director, and was promoted to sporting director in November 2022.
Edu has played a key role in supporting Mikel Arteta, and helping the Spaniard transform the Gunners into Premier League title contenders.
Reports emerged on Monday, however, that the Brazilian was quitting his role, with speculation mounting that he will be joining Evangelos Marinakis' footballing organisation - the Greek magnate owns Nottingham Forest and Olympiakos.
"This was an incredibly hard decision to make," Edu said in a statement released on Arsenal's website.
"Arsenal has given me the opportunity to work with so many amazing people and the chance to be a part of something so special in the club’s history. It has been a special journey.
"I've loved working with so many great colleagues across our men’s, women’s and academy teams, especially Mikel, who has become a great friend.
"Now it is time to pursue a different challenge. Arsenal will always remain in my heart. I wish the club and its supporters only good things and all the very best."
The news comes after Arsenal were beaten 1-0 by Newcastle United on Saturday to leave them seven points adrift of Premier League leaders Liverpool.
Arsenal face Inter in the Champions League on Wednesday.
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