Last Updated: 11/12/13 9:46pm
Thanks for following tonight's live commentary. Arsenal will discover their last-16 opponents on Monday. Stick with us for a full match report, reaction and ratings.
Full-time in France: Marseille 1 Borussia Dortmund 2. Final Group F standings: 1. Borussia Dortmund; 2. Arsenal; 3. Napoli; 4. Marseille.
Arsenal are keeping Napoli at the bay at the moment, but this group hinges on a knife-edge for them.
... Dortmund are now top of the group, with Arsenal in the runners-up spot. Napoli will miss out as it stands.
Huge penalty shout in Marseille as Lewandowski looks to be clattered in the area, but the referee doesn't give it! Still 1-1 there for Dortmund, who need a goal.
A flare-up between Aaron Ramsey and Federico Fernandez results in both players being shown yellow cards by referee Viktor Kassai (84).
Armero sends a low cross across the face of goal from the left, but Insigne can't control the ball. Then Koscielny's clearance almost spoons in under Szczesny's crossbar.
Despite going behind, Arsenal are still top of Group F, above second-placed Napoli on head-to-head. It's still Marseille 1 Dortmund 1 in France.
RED CARD! Arsenal captain Mikel Arteta sent off (76) for a second bookable offence. He was late in on Callejon.
Armero's ball in from the left was touched back to Callejon by Higuain, and then quickly returned to the Argentinian. He spun on the edge of the area and sent a low shot past Szczesny - an excellent finish.
Szczesny is earning his corn now, punching a dangeorus ball clear and then diving bravely at the feet of Fernandez.
The first Arsenal player booked is skipper Mikel Arteta (63), who caught Valon Behrami with a late tackle.
Napoli are in the ascendancy but Mertesacker blocks Mertens' volley. Great atmosphere at San Paolo now.
Best chance of the night so far for Napoli, and it's Armero who is presented with it as he accelerates onto a through-ball down the left and finds himself one-on-one with Szczesny - but his shot is tame, straight at the keeper and easily saved.
Albiol eventually snuffs out concerted Arsenal pressure as Cazorla tries to slip a pass through to Giroud on the right-hand side.
Behrami's heavy touch ends another Napoli attack. Giroud almost closes down Cabral in time at the other end.
After a long spell of Napoli possession, Ozil gets a sight of goal after fine work by Cazorla but the German gets his shot all wrong.
#Legacy aka @SwiftzArtist on Twitter writes: 'Arsenal are playing well, just need an end product really. I'm gonna say 2-0 to Arsenal (Giroud and Ozil).'
Half-time too in the other game in Group F - it's Marseille 1 Borussia Dortmund 1. As it stands, Arsenal will win the group with 13pts, while Dortmund will go through as runners-up due to a better head-to-head record over Napoli.
What are your thoughts on the first 45 minutes? What will happen in the second half? Get in touch with me by emailing me at email@example.com or hit me up on Twitter at @jonboy79.
Half-time: Napoli 0 Arsenal 0. All going well so far for the Gunners, who remain on course to reach the last 16.
Armero's left-wing cross deflects off Koscielny but the ball flies into a grateful Szczesny's gloves.
Szczesny makes a crazy decision to try and chip the ball over Higuain. Fortunately for the Pole it's right onto the Napoli striker's forehead and it bounces straight out.
Koscielny cleans up with style after Napoli put in another raid down the right. He lures Dzemaili into a late challenge and the Swiss becomes the second player booked (41).
Big chance for Maggio - Higuain released him down the right with an excellent pass. The Italy international tried to lift the ball over the onrushing Szczesny but he overhits it.
Dries Mertens is the first player to be booked (36) - he went in for a very untidy challenge on Rosicky.
A red card at the Stade Velodrome - Marseille lose Dimitri Payet to a second bookable offence in the space of two minutes and are reduced to 10 men against Dortmund. Still 1-1 in that game.
The Gunners have settled into their own game now, and Napoli are finding it harder and harder to win the ball back.
Impressive save from Cabral to deny Giroud, who was in space on the left side of the area after Ozil's pass and unleashed a fierce shot.
Brilliant play from Cazorla, who stayed on his feet after Maggio's scything challenge and ensured Arsenal retained possession.
Armero gets in behind on the left and tries to cross low, but Mertesacker is alert to the danger once more.
Rosicky is walking a little gingerly after being on the end of a heavy challenge. He should be able to run it off, though.
Clever idea from the set piece - Callejon runs onto a lofted ball, but it doesn't develop into a clear chance for the hosts.
Rosicky comes in for a sliding tackle on Higuain. Looked like he won the ball just as the Argentinian was about to shoot, but referee Kassai gives Napoli a free-kick.
Maggio crosses from the right, and Pandev's flick hits Koscielny in the head. Napoli appeal in vain for a handball.
Equaliser in the south of France - it's now Marseille 1 Dortmund 1. Souleymane Diawara with the goal for the hosts after 14 minutes.
Napoli are closing down well, and disrupting Arsenal's rhythm when they can. Jenkinson gives the ball away to Armero, but Mertesacker gets the visitors out of trouble.
Szczesny saves comfortably low down to deny Pandev, who got a shot away in the box from Mertens' excellent pass.
Scrappy sort of opening to this game. Napoli having the best of it so far, but the midfield battle looks key.
The Napoli fans know their team will have to be win by at least three goals if Dortmund are victorious. They're still in good voice early on though.
Goal in the other game in Group F - it's Marseille 0 Dortmund 1. Robert Lewandowski gives last season's runners-up a fourth-minute advantage. That's not good news for Napoli.
The fans are applauding to remember Nelson Mandela. Viktor Kassai from Hungary is tonight's referee - he's the same official who took charge of AC Milan 4 Arsenal 0 in February 2012.
The mascot assigned to Mikel Arteta is having a hard time of it - bawling his eyes out. Maybe he wanted to be with Jenkinson.
The teams are on their way out of the tunnel. Arsenal are in their red home kit, Napoli are in their yellow away kit (strangely).
Mesut Ozil has scored only once in an away game in the Champions League - at Allianz Arena, back in April 2012. Meanwhile, Gonzalo Higuain has never scored against an English team in the competition.
Arsenal were defeated 4-0 in their last trip to Italy (versus AC Milan in February 2012). Overall their record in Italy in the Champions League is W3 D3 L3.
Gary Neville: 'Arsenal need to keep that crowd quiet.' The Stadio San Paolo faithful look to be in good voice tonight for sure. Jeff Stelling notes that it's a very different atmosphere to the Emirates, but memories are still fresh of Arsenal's victory at Dortmund in front of the passionate 'Yellow Wall'.
There are some tempting Sky Bet Price Boosts on this game too. Goran Pandev to score first is now 9/1 (the Macedonian netted twice against Udinese in Serie A on Saturday), while Santi Cazorla can be backed at 14/1 to bag the opening goal.
Time to look at the betting. Arsenal are the 8/5 favourites with Sky Bet to win the game, with Napoli available at 7/4. If you think a draw is worth backing, it's 12/5.
More feedback, this time from Twitter. Shane McHenry, aka @shaney508, tweets: 'I think Napoli will come out the blocks quickly but Arsenal will control things fairly early. Arsenal to win 2-1.' Meanwhile, @bongo_palmer says: 'I'm going for a bit of a punt here. I'm saying Arsenal to get a man sent off, and for Napoli to win 3-0.'
Let's get some of your feedback now - emails first. 'I think Arsenal will under-perform today,' says Nafiul Islam, 'so I would go with a 2-0 win for Napoli with Higuain getting the goals.' However, Hayden Jenkins is optimistic: 'Big game tonight, but can't see us coming away with anything other than a win. Going to be a tighter game this time round but going for 2-1 to the Gunners. Great season so far, let's keep it going and smash City on Saturday!'
If Napoli and Dortmund both win, it's going to get very complicated as both of them and Arsenal will all have 12 points. A three-way head-to-head comparison will be needed, with their results against Marseille discounted.
A draw is only enough for Napoli if Dortmund, who have a superior head-to-head record, lose at Marseille - and the French club have lost all their games so far.
Here's the permutations for tonight's game: Napoli must win by a three-goal margin to be sure of a place in the last-16, regardless of the result of the other game (Marseille v Borussia Dortmund).
The Napoli side shows three changes to the one that started the 3-3 draw with Udinese in Serie A on Saturday. Pablo Armero, Valon Behrami and Dries Mertens come in; Lorenzo Insigne and Gokhan Inler drop to the bench, while Anthony Reveillere will not be involved tonight. The weekend result left Rafa Benitez's men third in the league, eight points behind leaders Juventus.
Arsenal have made two changes following the 1-1 draw with Everton in the Premier League on Sunday. Jack Wilshere and Aaron Ramsey drop to the bench with Mathieu Flamini and Tomas Rosicky coming in. Theo Walcott is again among the substitutes.
Wenger: 'We have some players with small muscular problems - Wilshere and Ramsey a little bit - so I have decided to rest them, but not necessarily with Manchester City in mind.'
Arsene Wenger: 'We will be trying to win the game. Let's do our job as well as we can. We're a team that likes to go forwards.'
Arsenal starting line-up v Napoli: Szczesny; Jenkinson, Mertesacker, Koscielny, Gibbs; Flamini, Arteta; Rosicky, Cazorla, Ozil; Giroud.
So no Pepe Reina in the Napoli team tonight - the Spain goalkeeper has not been able to shake off a muscle injury in time. Brazilian keeper Rafael Cabral, 23, continues in goal after making his debut in the 3-3 draw at home to Udinese at the weekend. Former West Ham man Valon Behrami is fit to start however, but Marek Hamsik (foot) is out.
Napoli starting line-up v Arsenal: Rafael; Maggio, Fernandez, Albiol, Armero; Dzemaili, Behrami; Callejon, Pandev, Mertens; Higuain.