First real chance for Millwall as Connor Roberts plays a superb ball into the box but is agonisingly just beyond Ryan Tunnicliffe reach and the keeper gathers.

We're under way at the Liberty Stadium.

Image source, Reuters

Half a chance for Birmingham now as Michael Morrison glances a header wide from a corner.

Dion Dublin
Ex-Aston Villa striker at the Liberty Stadium

Swansea have turned it around. I don't know what the manager has done but it's working. They are missing a couple of good players through injury - Leroy Fer and Wilfried Bony - but they should have enough to win this tie.

No real chances for either side at Rochdale, with the hosts still seeing more of the ball. Milllwall have just had their first corner of the game but it was comfortably dealt with.

Coverage of this game is live now on BBC One and online. Tune in.

Alistair Bruce-Ball
BBC Radio 5 live at St Andrew's

Image source, BBC Sport

Conor McNamara and former Republic of Ireland international Andy Townsend are wrapped up warm at St. Andrew’s as they bring you commentary on 5 live Sports Extra.

Conor is the commentator who has everything, handily providing a couple of hand-warmers to his colleagues to go inside the gloves which have been gratefully received.

Big chance for Huddersfield!

David Stockdale fluffs his clearance, hitting the ball straight to Abdelhamid Sabiri but the forward panics and sweeps his shot harmlessly wide.

Simon Stone
BBC Sport at the Crown Oil Arena

It might not appear so but a lot of work has been done to this pitch over the past week or so to get Rochdale's FA Cup replay on tonight.

The prize for the winners is a fifth round tie with either Newport or Tottenham.

Don't imagine Newport would be fussed about playing here but Tottenham boss Mauricio Pochettino might be a little put out.

Image source, BBC Sport

Brio Bartowski: Swansea will win though there is an imminent struggle expected. Huddersfield will have a deserved win.

Simon Atkins: Birmingham starting to perform in the league, steering slowly away from the bottom three. Would love to have an extended cup run to go alongside it.

The hosts keep up the early pressure on Millwall as Joseph Rafferty beats his man on the wing before firing a cross into the area but the visitors clear.

After a couple of minutes both players get back up and appear OK.

Break in play at St Andrews after a nasty looking clash of heads between Tommy Smith and Cheikh Ndoye.

Simon: Best veteran strike force for Wycombe was Cyrille Regis RIP and Simon Garner. Awesome! 37 and 36 respectively in 1995.

The pitch at Rochdale does not look great at all, almost half of it appears to be missing grass!

The hosts clearly know how to play on the surface, though, and they get at Millwall straight from the off as Andy Cannon hits an effort just wide.

Ged Scott
BBC Sport at St Andrew's

Even with Manchester United the prize in the next round, Birmingham City clearly have one eye on this coming Sunday's derby against Aston Villa, judging by their team selection.

Boss Steve Cotterill has made seven changes from Saturday's 3-1 win at Sheffield Wednesday - their second straight victory.

That means pretty much the same team that played In the original tie at Huddersfield 10 days ago and neither of their two men on nine bookings - key midfielders Maikel Kieftenbeld and David Davis - are involved at all.

Huddersfield, who have lost their last five Premier League games, have also made a lot of changes - six in total.

Image source, PA

Huddersfield fullback Scott Malone hits a pretty ambitious effort from distance at goal, straight into the keeper's hands.

Andrew Gillies
BBC Radio 5 live at Liberty Stadium

Image source, BBC Sport

Alan Hardy, the owner of Notts County, has just told Mark Pougatch on 5 Live that he can’t enjoy the game tonight because were they to win it would be worth nearly £750,000 to the club...

Under way at St Andrews and not far off at Spotland.

It a similar scene in Rochdale. Having been to Spotland on a cold midweek night, when it is cold there, it is very cold.

Anyway, almost time for kick off in two of the three replays tonight.