Ben from Lymington: You can tell Sanago plays for Arsenal. Do the hard stuff with some lovely skill and finish, then through on goal and wastes a great chance. Frustrating!

Ben in Lymington: Wenger in? Wenger out? What's it going to be after this game?

Arsenal are looking threatening going forward today, with Alexis Sanchez becoming more and more central to the game. Of course we all know that the Gunners' problems are usually at the other end.

Gary Lineker
BBC Sport

On Twitter:, external I hear that Sanogo has scored. 'Hear' rather than 'see' as we've managed to lock ourselves out of our own home. Such joy!

I'm sure Gary is following the game on the BBC Sport app.

Alexis Sanchez is a fantastic player, three Borussia Dortmund defenders surround him and it takes a foul from Neven Subotic to stop him. The centre-back is the first player in the book today.

In Group A, Atletico Madrid have taken the lead and it has come from another defensive error. Olympiakos goalkeeper Roberto inexplicably plays the ball straight to Juanfran who crosses to Raul Garcia for a tap-in.

Image source, Reuters

Corner to Arsenal, Alexis Sanchez - who has been quiet so far - wins it and Santi Cazorla whips it in but it's cleared by Dortmund, who counter with Henrikh Mkhitaryan.

Pierre-Emerick Aubameyang, one of the fastest players around, thinks he might be in for a second but Kieran Gibbs does well to tackle him.

Yaya Sanogo has a chance for a second. He is played in on goal, he has the chance to fire home with his right foot from 18 yards but he tries to cut back onto old lefty, where he runs into a Borussia Dortmund player.

Still the chance is not gone as the Dortmund player gives the ball back to Sanogo, but his shot is off target. Wasteful.

Harry Gray: Has anyone got a hat for me to eat? Sanogoal!!

Cheggers Peterborough: Well then.... That shut me up.

...But Liverpool are now level, Rickie Lambert heading home via the post.

There's been an early goal involving the other Premier League side in Champions League action today.

Liverpool trail Ludogorets Razgrad 1-0, with keeper Simon Mignolet at fault.

Check out 5 live commentary and text updates here.

Some Body:, external Lol at the 23,657 people who were dissing Sanogo!

Luke:, external Erm who was saying Sanogo was a bad choice?

Louis Porter:, external Sanogo pulls through just as people hate on him even more. It had to be him!

Borussia Dortmund push for a leveller straight away but a shot comes off Pierre-Emerick Aubameyang, who was in an offside position.

They have not dropped a point in the Champions League yet this season.

Atletico Madrid will look to secure their place in the knockout stages of the Champions League. The Spanish side need a victory over Olympiakos to guarantee their progress with a game to spare. All four sides can still qualify from Group A with Malmo, currently on three points, hosting Juventus who have six.

Victory for Bayer Leverkusen over Monaco will guarantee their progress from Group C. Russian side Zenit St Petersburg have given their own qualification hopes a major chance with a 1-0 win against Benfica earlier in the day meaning the Portuguese side are unlikely to qualify. Danny scored the goal 11 minutes from time.

Image source, AP

You cynics! Yaya Sanogo shows why boss Arsene Wenger starts with him as he receives a throw-in with his back to goal, does a bit of keepy-ups, backheels the ball to Santi Cazorla, who plays the ball back to the Frenchman to fire home.

Image source, Getty Images

Arsenal get us under way at the Emirates. A draw in either game in this group takes the Gunners through.

Tom Colman:, external It must crush Hector Bellerin's confidence seeing a CB starting over him in his position. I know he is young but he needs a chance.

Aj:, external Only player that doesn't deserve arsenal shirt is Yaya Sanogo and he is getting place in starting XI in such a crunch game.

Nick meel:, external Sanogo starting...... what do u see in him Wenger? Hope he proves your faith in him today.

Both sets of players - with mascots in tow - come out of the tunnels.

It's Champions League anthem time - my wait for some legend to start singing along to it goes on sadly.

Moments to go.

Just a reminder of tonight's line-ups. Arsenal have 17-year-old Ryan Huddart as their back-up keeper on the bench.

Arsenal: Martinez, Chambers, Mertesacker, Monreal, Gibbs, Arteta, Oxlade-Chamberlain, Ramsey, Cazorla, Sanchez, Sanogo. Subs: Huddart, Koscielny, Rosicky, Podolski, Flamini, Campbell, Bellerin.

Borussia Dortmund: Weidenfeller, Piszczek, Subotic, Ginter, Schmelzer, Mkhitaryan, Bender, Gundogan, Grosskreutz, Immobile, Aubameyang. Subs: Langerak, Hornschuh, Kehl, Kagawa, Jojic, Ramos, Durm.

Referee: Viktor Kassai (Hungary)

Mick Champness: Pack your bags Lukas Podolski and join a club where the manager appreciates what you can offer. Utter joke, Wenger!

Roger Lidher: Time for Wenger to go now. He's out of touch with reality. Talks about solidarity but has been letting the fans down for years as he won't accept his mistakes and rectify them.

Image source, Empics

These clubs played in the Uefa Youth League earlier today. Arsenal's Under-19s beat Dortmund 1-0 at Meadow Park.

Daniel Crowley missed a penalty but Stephy Mavididi tapped in Alex Iwobi's cross for the only goal.