Costa goal seals tie for Atletico in Spain
Koscielny will miss World Cup after Achilles injury
Marseille score in extra-time to beat RB Salzburg and reach final
Atletico Madrid 0-0 Arsenal
There was a delay of several minutes while medics attended to Laurent Koscielny.
We've been back under way about five minutes but other than that chance for Diego Costa shortly before the injury, there's been little threat on the Gunners goal.
RB Salzburg 0-0 Marseille
It looks like an absolute cauldron inside the Red Bull Arena. The atmosphere was bubbling nicely outside the ground and there's still quite a bit of smoke from flares floating around the ground.
As if to dampen that fervour, Marseille opened up with a spell of keep ball in the corner.
Image source, Getty ImagesAtletico Madrid 0-0 Arsenal
Credit to Atletico fans who joined Arsenal's 3,000 travelling supporters in applauding Koscielny as he was carried off.
The Gunners are going to have to reach the final without their captain.
Atletico Madrid 0-0 Arsenal
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
It's a big worry for Arsenal and they are going to have to make a change. Koscielny has been Arsenal's best defender over the years and what a huge task Calum Chambers has. He is going to have to play out of his skin.
Atletico Madrid 0-0 Arsenal
Laurent Koscielny has been lifted on to a stretcher and is being carried off. He has his hands covering his face.
Arsenal have lost their captain.
That's a huge blow. Calum Chambers has made his way on to the pitch.
Image source, ReutersAtletico Madrid 0-0 Arsenal
Awful news for Arsenal!
Laurent Koscielny has gone down with no one near him and is flat out in distress.
It looks like a serious injury.
Image source, ReutersAtletico Madrid 0-0 Arsenal
Danger!
Diego Costa glides past Nacho Monreal as though he isn't there, cuts inside the area and suddenly he's in on goal with only David Ospina to beat.
Side-netting! Big let off for the Gunners.
Image source, ReutersAtletico Madrid 0-0 Arsenal
Decent by Arsenal.
Alexandre Lacazette fizzes the ball across the six yard area and an Atletico shirt chests it out for a corner.
An encouraging move involving Aaron Ramsey and Mesut Ozil.
Atletico Madrid 0-0 Arsenal
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
You can see how Atletico have set up. They have gone 4-4-2 and they are going to press Arsenal high and put them under pressure from the off.
Atletico Madrid 0-0 Arsenal
Spanish tennis legend Rafael Nadal is in the stands. I think we can probably guess who he's supporting...
Image source, ReutersAtletico Madrid 0-0 Arsenal
Whistles each time an Arsenal shirt touches the ball.
Diego Simeone is banned from the dugout and is cutting an isolated figure sat on his own on the balcony of an executive box.
The Gunners have survived an early Atletico corner.
Image source, ReutersAtletico Madrid 0-0 Arsenal
The handbrake is off according to Arsene Wenger!
Will Arsenal motor to the Europa League final?
We're under way.
Image source, Reuters#bbcfootball or text 81111
Andrew: If ever a big game performance was needed from Mesut Ozil, it is tonight. Arsene Wenger has defended him from endless criticism of going missing when he is needed the most by his team. It’s now time he repaid that faith when his manager needs it.
Atletico Madrid v Arsenal (20:05 BST)
A reminder of how the teams are lining up...
Atletico Madrid: Oblak, Thomas, Gimenez, Godin, Lucas, Vitolo, Saul, Gabi, Koke, Costa, Griezmann.
Arsenal: Ospina, Bellerin, Mustafi, Koscielny, Monreal, Xhaka, Ramsey, Wilshere, Ozil, Welbeck; Lacazette.
Image source, Reuters
Image source, ReutersAtletico Madrid v Arsenal (20:05 BST)
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
Diego Costa loves playing against Arsenal. During his time in England he roughed the Arsenal back-line up and that's why he is starting. It was a no-brainer getting him in the team.
This game for Arsenal is all about how they defend. I think they will create chances going forward because they have talent in attack, but it's at the back where you worry. Atletico scored last week when they weren't even trying to score.
Atletico Madrid v Arsenal (20:05 BST)
This place is rocking. Red and white everywhere.
The teams are in the tunnel and we're almost ready to go.
How are the nerves Arsenal fans?
Image source, Getty ImagesAtletico Madrid v Arsenal (20:05 BST)
Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live
Atletico are the toughest test remaining in the competition. You only have to look at their defensive record at home. This is a battle-hardened team. If Arsenal manage to get through they will be favourites in the final.
Atletico Madrid v Arsenal (20:05 BST)
Fantastic atmosphere inside the Wanda Metropolitano.
Around 60,000 expected tonight and most have already taken their places.
Atletico fans are here to party and there's a whole section jumping up and down singing their hearts out while waving flags.
Will the Gunners gate-crash?
Image source, ReutersAtletico Madrid v Arsenal (20:05 BST)
You can almost hear the sound of home teams rubbing their hands with glee when Arsenal come to visit in the Premier League.
After all, the Gunners have yet to pick up a point on their travels in 2018.
It's a different story in Europe.
They've won away at AC Milan and Ostersunds while they have also managed a 2-2 draw at CSKA Moscow. A repeat of that scoreline tonight will do the Gunners nicely!
Image source, REXAtletico Madrid v Arsenal (20:05 BST)
George Cummins
BBC Radio 5 live in Madrid
Back in 2014 Arsene Wenger listed his 10 favourite games as Arsenal manager.
One of them was here in Madrid but down the road at the Bernabeu.
An understrength Arsenal, featuring a back four of Eboue, Toure, Senderos and Flamini managed to keep out Zidane, Beckham, Guti, Robinho and Ronaldo.
They stunned Real Madrid and a Thierry Henry goal saw them leave with a 1-0 win.
Twelve years on can Arsenal do it again against Atletico and pull off the miracle in Madrid to give Wenger the send off he deserves.
We have full commentary on 5 Live Sport at 20:05 BST.
Image source, Getty Images