John Murray
Commentator on BBC Radio 5 Live

It could be a nervy, edgy night here in north London depending on how this second leg develops. That late goal from Galeno has absolutely changed the persepective of this tie altogether.

The Porto fans in that far corner of the stadium will be aware of the terrible record that their side has in England, but that Galeno goal in the first leg means that they don't have to win here tonight. A draw would be enough.

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As expected David Raya, who couldn't play for Arsenal against parent club Brentford at the weekend, returns in goal, with Aaron Ramsdale among the substitutes in the only change from their last match.

Gabriel Martinelli is not in the squad with a foot injury.

Arsenal XI: Raya, White, Saliba, Kiwior, Gabriel, Rice, Jorginho, Odegaard, Saka, Trossard, Havertz.

Subs: Ramsdale, Hein, Tomiyasu, Soares, Zinchenko, Elneny, Partey, Vieira, Smith Rowe, Nelson, Nketiah, Jesus.

Image source, .

Porto are third in the Primeira Liga and their side includes two players called Pepe - the veteran Portuguese defender and the Brazilian winger.

Galeno has scored five times in this season's Champions League and also registered three assists.

Porto XI: Costa, Mario, Pepe, Otavio, Wendell, Varela, Nico, Pepe, Conceicao, Evanilson, Galeno.

Subs: Ramos, Pedro, Cardoso, Sanchez, Grujic, Eustaquio, Jaime, Baro, Borges, Taremi, Namaso, Martínez.

Image source, Getty Images

Arsenal may be trailing in the tie but they have won all three of their Champions League home games this season by an aggregate score of 12-0.

They have never won four in a row at home without conceding in the competition.

Bukayo Saka, who starts again tonight, has both scored and assisted a goal in all three of his Champions League home appearances too.

David Raya is back in the side tonight for Arsenal, replacing Aaron Ramsdale. Full team news to come.

Image source, Getty Images

Xavi makes three changes to the Barcelona side which beat Mallorca 1-0 in their weekend La Liga match.

This includes Robert Lewandowski coming into the XI, after the Polish striker was on the bench against Mallorca in preparation for this match.

Ronald Araujo and Fermin Lopez also come into the team.

Barcelona XI: Ter Stegen; Kounde, Cubarsi, Araujo, Cancelo; Lopez, Christensen, Gundogan; Yamal, Lewandowski, Raphinha.

Subs: Pena, Astralaga, Inigo Martinez, Joao Felix, Romeu, Roque, Sergi Roberto, Casado, Hernandez, Guiu, Fort.

Image source, Opta

There are two changes to the Napoli side which started their previous match, a 1-1 draw with Torino in Serie A.

Amir Rrahmani starts at centre-half, while Hamed Traore comes into midfield.

Victor Osimhen, as expected, leads the line.

Napoli XI: Meret; Di Lorenzo, Rrahmani, Juan Jesus, Rui; Anguissa, Lobotka, Traore; Politano, Osimhen, Kvaratskhelia.

Subs: Contini, Gollini, Natan, Olivera, Simeone, Cajuste, Ngonge, Lindstrom, Mazzocchi, Ostigard, Raspadori.

Image source, Opta

Image source, BBC Sport

Image source, Getty Images

Yes, it was a horrible moment for Aaron Ramsdale in the 2-1 win over Brentford on Saturday - especially with all eyes on him - but he made amends in the second half.

That showed real strength of character. He was also helped by the great support he received from Arsenal's fans.

I'm sure David Raya will be back against Porto tonight but who knows if Ramsdale will play again?

I fully expect him to leave in the summer because a keeper of his quality and ambition will want regular first-team football.

As for where he will go, I'm not quite sure. My initial thought was perhaps Chelsea but I have been impressed with Djordje Petrovic, so we will see.

Barcelona

Image source, Getty Images

Barcelona drew 1-1 in Italy against Napoli in the first leg but Barca boss Xavi wants his team to play without fear at home.

He said: "We have to be the better side here. We must not be afraid of making mistakes.

"The players need to control their emotions so they don't rebound against us.

"I expect to be up against a valiant Napoli side who will play out from the back and try to control possession.

"I don't think they will sit back with the tie as it is."

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Mikel Arteta says Arsenal can "control better" tonight's second leg, but hopes fans will bring the "energy" to help the team over the line.

The Gunners, who have been in impressive Premier League form, struggled to create chances in their 1-0 defeat in Portugal.

"Now we know them a bit better. We have played these kind of games many times in the Premier League - we played one two days ago," said Arteta.

"We'll just focus on being ourselves and do more of the things that we can control better than we did a few weeks ago.

"We have to make it happen but we have to be very good to achieve that."

We want to hear your thoughts on tonight's Champions League action.

Can Arsenal overcome their knockout stage hoodoo or will Porto prove a tough nut to crack once again this evening?

After a tight first leg in Italy, will it be Barcelona or Napoli to advance to the quarter-finals from this evening's other tie?

Write in via #bbcfootball on 'X', text 81111 (UK only - standard rates apply) or WhatsApp 03301231826

Please make sure to add your names to any messages sent in.

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Two BIG games in the Champions League coming up tonight.

It's the second leg ties in the last 16 and Arsenal need to come from behind to book their place in the quarter-finals.

They are trailing 1-0 to Porto but will hope the power of a home crowd at Emirates Stadium can help them get over the line.

Elsewhere, Barcelona welcome Napoli with the teams tied at 1-1 from the first leg.

We'll have updates from both games here...