Ahh that had to be it.

Caitlin Foord did well to make space on the left before picking out an unmarked Beth Mead at the back post, but the substitute heads wide.

She had to hit the target there at the very least.

It's all over!

Chelsea will play in a record-extending seventh consecutive League Cup final thanks to Wieke Kaptein's first half header.

City only have themselves to blame - they missed some absolute sitters.

Image source, Getty Images

Six minutes of stoppage time. That's all that remains for Arsenal to get a precious equaliser.

Jess Park looks to make the result sure from range but her curling effort loops high and wide.

That could be City's last chance!

Vivianne Miedema fizzes a cross into the box, but Lauren Hemp can't quite sort her feet out and her scuffed finish sends the ball wide! Wow.

Would-be match winner Elisabeth Terland is replaced for the final few minutes by January arrival Lea Schuller.

United are so, so close to a first-ever League Cup final.

Chelsea take an age to take a corner, and immediately win another one. The visitors know exactly how to run the clock down.

Time is fast ticking away for Arsenal now.

Phallon Tullis-Joyce bellows at captain Maya Le Tissier to dive out of the way of Caitlin Foord's cross so she can claim the ball and use up a few more seconds for United.

Rachel Brown-Finnis
Former England goalkeeper on BBC iPlayer

This is where Chelsea need to stay watertight. They cannot give anything away to Man City.

Image source, Getty Images

Four minutes added on. Can City find an equaliser?

Arsenal want a penalty after Katie McCabe's shot at goal is deflected off course by the hand of Dominique Janssen.

The Republic of Ireland captain is pleading her case furiously with Stacey Fullicks but it won't change the referee's call of no spot kick.

Lauren Hemp strikes from the edge the box but Hannah Hampton palms away. City aren't giving in.

That should have been game, set and match for Chelsea as the visitors hit City on the break, but Alyssa Thompson's low ball across the face of goal is too heavy and evades Lauren James at the far post.

That's Thompson's final contribution of the evening, as she's replaced by Johanna Rytting Kaneryd.

One final roll of the dice from Renee Slegers as she bring on Beth Mead for the exhausted looking Alessia Russo.

It's been a pretty thankless task for her tonight up against United's two centre- halves but she stuck to it very well.

Andree Jeglertz rolls the dice as forward Iman Beney replaces right-back Kerstin Casparij.

It's now or never for City.

Alessia Russo drops deep to pick the ball up on the half way line, shrugs off two United defenders and sets Smilla Holmberg running into the channel.

The 19-year-old full-back drives infield before her left footed shot deflects wide of the target.

City look to be running out of steam a bit, which is good news for Chelsea. The visitors are beginning to enjoy spells of possession, something they haven't been able to do all night.

City create another chance, but Vivianne Miedema heads over from a corner.

Rachel Brown-Finnis
Former England goalkeeper on BBC iPlayer

Chelsea are happy to keep the ball. They're masters of this.

They're winners. Every single one of them.

Image source, Getty Images

It's flat from Arsenal.

They don't seem to have any ideas about how to break Manchester United down and are just flinging crosses into the box hoping the ball will fall kindly to a player in red and white.

Sandy Baltimore flashes a dangerous low cross across the face of goal, but there is nobody in Chelsea blue to meet it.