A change for both sides as Cheikh Ndoye is replaced by Jota for Birmingham while Tommy Smith comes off for Florent Hadergjonaj for Huddersfield.

Ndoye and Smith were involved in an early clash of heads.

Image source, PA

Notts County are pressing high now and are the dominant side. Where was this football earlier? Another good attack ends with Kristoffer Nordfeldt punching away Jorge Grant's shot on the half volley.

Sam Clucas takes one for the team as he brings down Jorge Grant on the break, earning himself a yellow card.

Notts County are pressing a bit now. Another goal for them before half time would make things interesting. There's a touch under five minutes to go until the break.

Merican: Maybe it's not over after all

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

Chances are at a premium but it has been competitive.

As the game goes on both teams will feel there’s an opportunity to win the game.

There’s a great opportunity for a shock here from Birmingham.

Watch as Rochdale and Millwall share two chances in the first-half. Both show just about as much promise as the pitch.

Dafydd Pritchard
BBC Sport Wales at the Liberty Stadium

"We're going to win 4-3," is the admirably optimistic chant from the Notts County fans after Noor Husin's excellent strike.

Tammy Abraham wraps off a nice move to give Swansea the early goal in their fourth round replay against Notts County.

Max: Just watched the first 20 mins of the FA cup 4th round and Tammy Abraham and Nathan Dyer have been on fire!

James: Get in there Nathan. Great to have him back fully fit

No, replays show it was little more than a brush of the arm by Mike van der Hoorn and play continues.

And it should have been 4-0 as Mike van der Hoorn thumps a free header over the bar.

Hang on, looks like Van der Hoorn might have put an elbow into the face of a Notts County player.

Referee Martin Atkinson is consulting the video assistant referee to see if any action needs to be taken.

And this one probably is as well.

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

I think the onus is on the home team to set the tempo.

When you’re and underdog, if you give the fans some hope, a little taste of something to come, they’ll drag another yard out of you.

This one looks to be going the distance...

Ged Scott
BBC Sport at St Andrew's

Whatever the outcome - and 0-0 and pens currently looks hot favourite, on this cold, cold night in Small Heath - it should still be an occasion with more meaning than most for Birmingham City right back Carl Jenkinson.

The once capped England international arrived at St Andrew's on loan from Arsenal in August on the back of a year-long knee injury, only to injure his shoulder half an hour into his debut, in a 2-0 home defeat by Reading.

This is his first home appearance since, having made his return after five months out in the 1-1 draw at Huddersfield 10 days ago. And, so far, he has looked pretty good, sending one particularly fine sweeping cross field pass which set up one of the few moments of excitement.

Merican: Two quick fire goals. That was unexpected

Simon Stone
BBC Sport at the Crown Oil Arena

I just watched a five minute period of this game and counted the number of passes the respective teams were able to string together at one go.

The most - by Millwall - was four. Most times it was two.

Not one for the purist this.