Kick-off at The Emirates: 7:45pm
- Arsene Wenger makes 10 changes with Lucas Perez returning to lead Gunners' attack.
- Sofiane Boufal makes just his second start for Southampton tonight.
- Josh Sims drops to the bench after impressive debut on Sunday.
- Draw for semi-finals to take place immediately following tonight's other quarter-final clash between Manchester United and West Ham United.
- Liverpool and Hull City have already booked their places in the final four.
Full-time: Arsenal 0-2 Southampton
Southampton progress into the semi-finals of the EFL Cup.
The latest corner comes in and the superb van Dijk clears. Gibbs gets a rush of blood to the head and smashes a wild effort over the bar on the follow up.
Arsenal are pushing again and win a succession of corners in the final minutes. That have to make one of them count.
Four minutes of time added on at the Emirates. Southampton are still looking superb and, amazingly, the more likely to score the next goal.
Brilliant from Southampton again as Sims and Sam McQueen and combine delightfully down the right. Sims reaches the byline and cuts an inviting ball back across goal but Gabriel just about manages to hold off the Saints player rushing into the box.
Sims close to scoring again! The 19-year-old opens his body up and looks to bend one in the far corner but Martinez manages to push it wide. The Arsenal goalkeeper does well from the resulting corner, collecting confidently.
Southampton are having to survive a bit of an onslaught at the moment with Arsenal stepping up a few gears in pursuit of an equaliser. Aaron Ramsey felt he should have had a penalty among all that but his appeals were turned down. It looked as if Martina's challenge on his him was a clean one, too.
Steven Davies watches his deflected effort loop just over Martinez's cross bar. Arsenal have just over 10 minutes to rescue this but Southampton look as dangerous as ever going forward.
Ramsey is fed by Iwobi on the edge of the D and takes a touch before taking the shot on, but he slices it horribly wide. The Wales international has been hugely underwhelming tonight.
Arsenal have just under 20 minutes to rescue this, but they are yet to meaningfully test Forster in goal.
Iwobi receives the ball on the edge of the D and nudges it onto Coquelin who has time and space to lash one on goal. It's a vicious effort, but it is driven wide of Forster's post by the Frenchman.
There has been a couple of changes for Southampton in the last few minutes too, one of those enforced with Pierre-Emile Højbjerg replacing Harrison Reed. Moments later, Sunday's star Josh Sims enters the fray to replace the excellent Boufal.
And here's another change with Ainsley Maitland-Niles onto replace Jenkinson at right-back.
Change for Arsenal, Alex Oxlade-Chamberlain is on for Iwobi.
The corner comes in and Van Dijk and Martinez are left in a heap as another effort from Southampton trickles wide. Both players are seen to by their respective medical teams but look okay to continue.
Southampton nearly grab a third! It is end to end at the moment and the away side's latest venture forward frees Boufal on the edge of the box. He drops a shoulder and shimmies past his marker like he's not there before shooting for the far corner but a deflection takes it just wide.
Arsenal have started this half dangerously and come forward again with Jenkinson cutting an inviting ball back across the box. It falls to Ramsey who can't get a clean connection on the ball, lifting it straight into the path of Forster who easily claims.
Arsenal come forward with Ramsey sliding a pass through for Lucas who has broken to his left inside the box but the Spaniard's return pass is a poor one that is easily intercepted.
And we are back underway at the Emirates. No changes from either side.
Half-time: Arsenal 0-2 Southampton
Southampton have one foot in the semi-finals. They have dominated the Gunners so far.
Two minutes of time added on in the first-half. Southampton in utter control and look the more likely to score the next goal.
Granit Xhaka has entered the fray to replace Elneny.
Wow, this really isn't Arsenal's night so far. Mohamed Elneny is unable to continue, he is limping of having picked up an injury.
Southampton took the lead through Clasie's superb strike and it has just got even better.