Alex Howell
BBC Sport Arsenal reporter

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Coming into the season as defending Premier League champions, Arsenal were looking to make a statement signing to make their rivals take notice.

They did not bring in the attacker they wanted but Bruno Guimaraes looks like he could be that key arrival to help Mikel Arteta's men build on their success.

The 28-year-old midfielder is a 'win-now' signing in the peak years of his career.

He responded well to a disappointing performance in the defeat by Brighton, where he made his full league debut.

The Brazil international has now scored two goals that have helped his side to valuable points and justified the decision to spend big on him, even if the Gunners are inundated with top quality options in midfield.

Arteta said: "He wasn't at that level against Brighton, and this is the level for Arsenal. Every week, every game, every minute, every action, you have to be at that level.

"That's what we have to demand. This is what I demand of myself and I'm going to demand the same with the players. If we do that, he will raise the standards and we will be a better team."

Barcelona have scored 80 goals in 27 Champions League matches since Hansi Flick took charge, at an average of 2.96 per game. This is the highest goals-per-game ratio for any club with 20+ games under a specific manager in the competition (since 1992-93).

Expect goals, then.

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Barcelona haven't had much fun in the Champions League since they last won it in 2015.

They faced a premature exit at the quarter-final stage to Atletico Madrid last year but summer additions mean they're now better equipped to take on Europe's elite competition.

An opening day 5-1 win over Feyenoord has set them nicely on their way but now they must face Galatasaray in Turkey.

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Simon Stone
BBC Sport Chief Football News Reporter

Julian Alvarez makes his second start of the season for Atletico Madrid after his much-publicised efforts to get out of the club this summer. Skipper Koke is not involved after his mother passed away this morning. A minutes silence will be held before kick-off.

Atletico Madrid XI: Oblak, Llorente, Romero, Hancko, Grimaldo, Koke, Cardoso, Simeone, Barrios, Baena, Alvarez, Kang. Substitutes: Musso, Mendoza, Sorloth, Lookman, David, Ortiz, Pubill, Hjulmand, Le Normand, Litbua, Martinez, Castillo.

Michael Carrick has made five changes to the Manchester United side that drew with Tottenham at Old Trafford.

Carlos Baleba is given his full debut, with Marcus Rashford, Andrey Santos, Ayden Heaven and Diogo Dalot all coming in, with skipper Bruno Fernandes set to play in an unfamiliar right-sided role.

Luke Shaw and Kobbie Mainoo are both missing for the visitors after picking up injuries, while Harry Maguire, Matheus Cunha and Amad are on the bench, along with Netherlands defender Matthijs de Ligt, who has been out of action since last November with a back problem that eventually needed surgery.

Man Utd XI: Lammens, Yoro, Heaven, Martinez, Dalot, Andrey Santos, Baleba, Tielemans, Fernandes, Rashford, Mbeumo. Substitutes: Darlow, Mee, De Ligt, Maguire, Mount, Cunha, Zirkzee, Amad, Lacey, T Fletcher, Amass, Armer.

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The last person to manage Manchester United to an away win in the Champions League was... Michael Carrick five years ago.

It was a 2-0 win at Villarreal in November 2021, when Carrick was interim manager.

Atletico Madrid XI: Oblak, Llorente, Cuti, Hancko, Grimaldo, Giuliano, Barrios, Cardoso, Baena, Kang-in Lee, Alvarez

Man Utd XI: Lammens; Yoro, Heaven, Martinez, Dalot; Andrey Santos, Baleba; Fernandes, Tielemans, Rashford; Mbeumo.

Arsenal defender Gabriel has said he will would not hesitate to take another penalty in the Champions League if given the opportunity, despite missing the decisive spot-kick in the final against Paris St-Germain last season.

"In a final, anything can happen so I think we did really well. Of course, if I had another penalty I'm going to be there to take it and I think my team-mates helped me a lot after this," said Gabriel.

"Of course I was sad. I don't want to miss a penalty, but I've learned from this and if I have another opportunity I'm there to take it."

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Alex Howell
BBC Sport Arsenal reporter at Emirates Stadium

Mikel Arteta makes five changes to the side that beat Leeds at the weekend. Bruno Guimaraes who scored the winning goal at the weekend starts while Eberechi Eze also comes into the starting line-up.

Arsenal starting XI: Raya, Timber, Konsa, Gabriel, Lewis-Skelly, Rice, Merino, Guimaraes, Madueke, Eze, Gyokeres

Substitutes: Arrizabalaga, Meslier, Mosquera, White, Saka, Odegaard, Havertz, Calafiori, O'Neil, Dowman, Hashi, Salmon

Lille starting XI: Berke Ozer, Ngoy, Alexsandro, Bentaleb, Bakwa, Haraldsson, Perraud, Mukau, Ueda, Andre, Goffi

Substitutes: Gill, Sajous, Srdanovic, Giroud, Sahraoui, Kjaergaard, Basar Onal, Nianzou, Verdonk, Cossier, Perrin, Diaoune

Andros Townsend
Former Tottenham midfielder on BBC Radio 5 live

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Manchester United have two major issues - one in possession and one out of it.

In possession, they are a crossing team, but when your striker is [Bryan] Mbeumo on Saturday, or [Matheus] Cunha previously, and they have left [Benjamin] Sesko on the bench, it bemuses me a little bit.

Out of possession, I don't buy into the players not wanting it enough, but I think the way they press is completely wrong. They leave themselves open, they leave the number six with way too much time on the ball.

You can't leave the best players free to control possession.

It has been a poor start to the season for Manchester United with two wins from their eight games so far in all competitions.

They won their Champions League opener but their domestic form has been disappointing with just one win in six Premier League games leaving them 13th in the table.

Asked if he felt under pressure, Michael Carrick said: "It depends how you define pressure. There's our own expectation. We know what we're capable of doing as a team, what we expect as a group and as a football club. That comes from us.

"I certainly don't look outside or elsewhere of what it should look like. I know fine well what it should look like. I've felt it and I've felt the ups and I've felt the downs. I don't feel the pressure from that at all."

Former Arsenal forward Olivier Giroud could take on his former side tonight if he lines up for Ligue 1 side Lille.

The Frenchman made 253 appearances for the Gunners during six seasons with the club, scoring 105 goals and creating 38 assists.

To date, only two players have both scored for and against the Gunners in the Champions League (Tomas Rosicky and Eduardo da Silva).

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BBC Radio 5 Live

Kelly Cates presents build-up on 5 Live from 19:00, with full match commentary to follow at 20:00 with Paul Robinson and Ian Dennis.

Click the 'watch & listen' tab at the top of this page.

Alex Howell
BBC Sport Arsenal reporter at Emirates Stadium

This does feel like a chance for Mikel Arteta to rotate his squad but history shows that the Gunners boss doesn't usually do that too often.

Arteta prefers to keep the changes to a minimum but with six games this month, a couple of new faces in the starting line-up will be expected.

Eberechi Eze did not get off of the bench at the weekend and Mikel Merino was a late substitute and both players will be hoping for minutes this evening.

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Good evening!

The Champions League returns tonight with Manchester United and Arsenal both in action.

Both sides won their opening fixtures in Europe and will look to make it two wins from two, with Manchester United at Atletico Madrid and Arsenal hosting Lille.

Both games kick off at 20:00 BST.

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It doesn't take long in football for optimism and hope to fade.

Michael Carrick was named permanent Manchester United boss in May after an impressive run of form as interim manager that secured Champions League football for this season.

But just a few months on he is now a man under pressure, and is in Spain tonight hoping for a spark after a disappointing start to the season.