Jonathan Woodgate
Former England defender on BBC Radio 5 Live

It was rumoured that Middlesbrough turned down £10m for Djed Spence in the transfer window. He is destined for the Premier League and worth a lot more than £10m on this performance.

Brennan Johnson is taking the mickey. He beats Patson Daka with a neat trick before laying the ball off.

Michael Emons
BBC Sport at The City Ground

What a job Steve Cooper is doing at Nottingham Forest. He's only been in the job since September but taken the club from 24th to eighth in the Championship and looks to have masterminded FA Cup wins over both Arsenal and Leicester.

He took Swansea into the play-offs in both the past two seasons and what a boost to his Forest players this victory is going to be as they look to end a 23-year absence from the Premier League later this season.

They're also (probably) going to have a home fifth-round tie against Huddersfield to look forward to on Wednesday, 2 March as well.

Yep, frustrated is the word. James Maddison flies into a wild tackle on Djed Spence and is rightly booked.

Patson Daka fires over from the edge of the box. Leicester frustrated and desperate.

Not a bad time to make your debut. Sam Surridge - signed from Stoke in January - comes on for Keinan Davis for Forest.

Well, if Forest aren't going to win this we've got some finish to look forward to. Right now, though, that appears to be the only outcome.

Image source, Getty Images

Two Leicester corners in quick succession. Both dealt with by Forest. The Foxes look to be running short of ideas.

Martin Keown
Former England defender on BBC One

This is a real treat for Forest fans. It's as though they have climbed on board a time machine and been transported back to when this sort of performance was common at the City Ground.

I'm sure Brian Clough is looking down on this young Forest team and feeling quite proud.

Is that handball? Ryan Yates does use his hands to cushion the ball as it falls in the box, but he knew very little about it. The ref shakes away City protests.

Straight away down the other end, Max Lowe fires a shot past the far post.

Give me a second lads, please. I'm gonna lose an index finger at this rate.

Boredandycanoeclub: How good are Middlesbrough right backs if this kid is out on loan?

Martin Keown
Former England defender on BBC One

If you are just switching on, do not adjust your TV sets. It really is 4-1.

If Leicester are going to keep their Cup defence alive, they need to score very, very quickly.

Jack Colback is on for Philip Zinckernagel to beef up the Forest midfield.

Leicester send on Kiernan Dewsbury-Hall and Ricardo Pereira for Ademola Lookman and Youri Tielemans.

Jonathan Woodgate
Former England defender on BBC Radio 5 Live

That's another £10m on Djed Spence's price tag. What a performance by him. If Spence isn't a Premier League player next season, there is something wrong.

Martin Keown
Former England defender on BBC One

It's outstanding quality. Leicester are slow to react to a throw in. Djed Spence slots it with the outside of his right foot. Look how confident he is. Leicester simply cannot live with this.

I also need to tell you that before that goal, Ademola Lookman went down in the box after getting goal-side of his marker, but appeared to be looking for a penalty he did not get.

Brennan Johnson also drew a low save from Danny Ward just before the goal.

Can't take your eyes off this for a moment. My fingers are bleeding.

Oh, wait, yes he is getting booked. Did he talk his way into that? Or was the ref just weighing it up for a few seconds?

Wilfred Ndidi is putting himself about, not always legally. He takes down Philip Zinckernagel in the centre circle for a Forest free-kick. No booking, though.

Keinan Davis is down here. He took a bit of a whack from Wilfred Ndidi. Think he'll be fine, though. Just needs a moment.