If you're just tuning in then unlucky, you've missed a right first-half.

Thankfully, we can offer you a little insight into what has gone down.

Here are the Forest goals - all three scored in a nine-minute spell (with the first two separated by 24 seconds!)...

Jonathan Woodgate
Former England defender on BBC Radio 5 Live

Forest have dominated but that goal has got Leicester back in it. They need to do more in possession and really stamp their authority.

What a half.

Dust yourselves off people, have a lie down. We'll be back for another 45 minutes of this madness shortly!

Garner is going to be OK. He gets back to his feet and we go on.

James Garner is down holding his head. It's the knee of team-mate Scott McKenna that has done the damage as he ran over the top of him.

Martin Keown
Former England defender on BBC One

There is a lot of life left in this tie. Leicester need to get it out to the sides. I expect Brendan Rodgers to really get into his players at half-time. They are going to have to improve big time.

Three added minutes.

James Maddison chips a ball into the box for Kelechi Iheanacho but it beats him and skips through to Brice Samba.

Michael Emons
BBC Sport at The City Ground

Leicester have just been handed a lifeline after a sloppy mistake from home goalkeeper Brice Samba, with Kelechi Iheanacho, who could have put the Foxes ahead in the fifth minute, capitalising to continue an incredible first half.

But the Foxes problems are at the other end, with them looking vulnerable every time Forest attack. Seconds before Iheanacho pulled one back, Djed Spence had an effort saved by away goalkeeper Danny Ward.

Will that be a turning point? Great Sunday entertainment in the cup.

The Forest fans not quite so noisy now. They know that Iheanacho goal has given their side a tough second-half.

James Maddison has the chance to really set home nerves jangling with a free-kick wide left. He swings out straight over the bar, though.

Martin Keown
Former England defender on BBC One

Why on earth is the keeper coming out that far? He's really thrown one in there and it's a lifeline for Leicester.

Kirtan Patel: Shocking. @LCFC, external devoid of ideas and fans are scared every time the ball in our third. Something needs to chang

Could so easily be 4-0!

Forest carve through Leicester, with Keinan Davis setting up Djed Spence for a shot that Danny Ward saves.

"Are you Derby in disguise?" sing the Forest fans. Bit of an insult to Derby that. They've been reasonably solid under Wayne Rooney.

It really is quite alarming just how Leicester have capitulated here.

Conceding once is one thing, but the meltdown that followed it is a very troubling sight if you're Brendan Rodgers. This XI isn't lacking experience either.

Martin Keown
Former England defender on BBC One

Where are Leicester's leaders to get them out of this huge hole?

Everything Forest do is coming off. Every pass they make...

We've had a supporter on the pitch now. Took a couple of security lads to tackle them and whisk them away.

Lost his head.

Jonathan Woodgate
Former England defender on BBC Radio 5 Live

This feels like game over. I can't see Leicester getting back into the game from here.