Arsenal will play Man City in final on 25 February
Gunners have not won League Cup since 1993
Rudiger unlucky in both Arsenal goals with deflections
Barkley replaced injured Willian for Chelsea debut
Jermaine Jenas
Former Tottenham midfielder at Emirates Stadium
The forward run of Eden Hazard - you're not stopping him there. That move just felt too easy for me. It was too easy for Pedro to turn and find his strike partner. A very cool finish.
Eden Hazard
Image source, ReutersArsenal are carved open like the Sunday roasting joint.
It is delicious dot-to-dot passing from Chelsea as Tiemoue Bakayoko picks out Pedro in the hole and the Spaniard slips in Eden Hazard.
Laurent Koscielny, who was caught in two minds as to whether to close down Pedro or stick with his man, can't make up the ground and Eden Hazard toe-pokes home under the diving David Ospina.
Image source, ReutersJermaine Jenas
Former Tottenham midfielder at Emirates Stadium
It's a fantastic line from Arsenal and they played the offside trap perfectly. They squeeze at the right time but it's close for Chelsea.
Chelsea seem a little bit more comfortable in these early stages.
Arsenal 0-0 Chelsea
Cesar Azpilicueta supplies the precision ball in and Pedro buries the header.
It is a connection as sweet and slick as a Swiss timepiece - ALMOST. They are a milisecond out.
Pedro had strayed a fraction beyond the back foot of an Arsenal defender.
Offside. The linesman called it and doubtless Michael Oliver had it confirmed by VAR.
Image source, ReutersArsenal 0-0 Chelsea
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Arsenal 0-0 Chelsea
Not across the face of your own goal!
Alex Iwobi picks the pocket of Victor Moses down by his own corner flag, but then attempts a ludicrous ball to Jack Wilshere that puts his team in a whole load of bother.
Shot just wide from Chelsea.
Arsenal 0-0 Chelsea
Jermaine Jenas
Former Tottenham midfielder at Emirates Stadium
Arsene Wenger sees David Ospina as a top goalkeeper who needs the games. He's featured heavily in the Europa League and it's good that Wenger has stuck with him. We'll see what happens if they reach the final.
Arsenal 0-0 Chelsea
Arsenal fans are giving it some decibels now that the pre-match show has been silenced.
Their team knock it around midfield confidently.
Chelsea steal possession but Cesar Azpilicueta's ball forward comes to nothing.
Arsenal 0-0 Chelsea
Jermaine Jenas
Former Tottenham midfielder at Emirates Stadium
I think this is going to be a brilliant game and we're going to have lots of goals. The last game at Stamford Bridge didn't deliver. Semi-finals can be tentative at times and Arsenal did well to come away with a 0-0 result. Something has got to give tonight. Chelsea's front three could cause a lot of problems.
Arsenal 0-0 Chelsea
And we are up and running as Eden Hazard taps the ball back off the centre spot.
Arsenal v Chelsea (20:00 GMT)
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It's a no from the Guardian's man on the scene.
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Arsenal v Chelsea (20:00 GMT)
The house lights have been dimmed at the Emirates Stadium.
The Prodigy is blasting out the tannoy.
Those big Arsenal flags are twirling down by the pitchside.
Laurent Koscielny and Cesar Azpilicueta are at the head of the two queues in the tunnel.
Kick-off is incoming.
Arsenal v Chelsea (20:00 GMT)
It's fair to say that the introduction of VAR to English football hasn't been entirely smooth. Arsenal have kindly put an explanation on the big screen inside the Emirates ahead of the game. I wonder if they can prepare a slide on Uefa Nations League for us as well.
Image source, ReutersArsenal v Chelsea (20:00 GMT)
John Southall
BBC Radio 5 live football reporter at the Emirates
Your key facts for tonight.....
Arsenal have lost just once in their last seven meetings with Chelsea.
Chelsea are now unbeaten since 9 December.
Henrik Mkhitaryan is cup tied.
Alexis Sanchez will be watching with his dogs.
Chelsea start striker-less. No Dzeko (yet), Crouch, Carroll, Benteke etc.
The night's key question......
Will Willy Cabellero catch a cross ? He loves a punch.
Head-to-head....
Arsenal 75 wins
Chelsea 62 wins
Draws - 57
Tonight’s listening...
Commentary on Radio 5 Live.
Antonio Conte: Chelsea can't compete with Man Utd and Man City in terms of transfer fees
Henry Winter
Chief Football Writer for the Times
Chelsea can compete against the Manchester clubs if they promote some of their fantastic academy players. They're not exactly sat begging on Fulham Road. They've got the money there. But why should they spend when they've got the talent within?
Arsenal v Chelsea (20:00 GMT)
Chelsea defender Andreas Christensen on Sky Sports: "We've got to do our thing, go and play our game, that is the most important thing."
Arsenal v Chelsea (20:00 GMT)
Chelsea
Image source, Getty ImagesChelsea manager Antonio Conte tells Sky Sports: "We have prepared and want to play a good game and try to get to the final.
"For sure we have to do it, it is important to have a good performance and it is a big challenge. It is a massive game for us and Arsenal, there is a lot of balance between these two teams and we will see what happens."
#bbcfootball or 81111 on text (UK only)
Ah, this is one to savour. Not! One of the great English football fixtures - Arsenal v Chelsea. In the league cup semi final, a cup competition steep in history. Should be enthralling. But with one solitary Englishman (Wilshere) in the starting line up of either side. I feel totally disconnected from the modern game - especially from the top 6 teams.
Shaun, Bristol
Arsenal v Chelsea (20:00 GMT)
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This is the canny choice. Lower-profile player = less competition+ more novelty value for the target.
He'll go far.
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Arsenal v Chelsea (20:00 GMT)
Image source, ReutersEden Hazard had better get his reading glasses out.
The Chelsea kingpin handed his shirt, external over to a fan with a sign asking for it in the weekend's win over Brighton.
It's worth a pop from the young lad. I'd want to see proof of his date of birth though.