Preserving their league status remains the priority for both clubs this season - so it's no surprise to see both teams make several changes from the weekend.

But don't be fooled by the five changes made by Huddersfield boss David Wagner. This is still a pretty strong side. Attacking midfielders Aaron Mooy and Tom Ince are among the incoming players, while striker Laurent Depoitre and defender Christopher Schindler miss out through injury.

For Blues, there are seven changes from the 2-0 defeat at Manchester United. Striker Lukas Jutkiewicz, the former Terriers loanee who scored the equaliser in the original game, starts up top.

Blues XI: Stockdale, Morrison, Roberts, Dean, Bramall, Jenkinson, Ndoye, Gardner, Lowe, Adams, Jutkiewicz.

Town XI: Lossl, Smith, Jorgensen, Kongolo, Malone, Billing, Mooy, Quaner, Sabiri, Ince, Mounie.

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

Image source, BBC Sport

There’s a very wintry feel to St. Andrew’s this evening with light snow gently drifting down in the chilly night air.The prize for the winning manager is to pit their wits against Jose Mourinho in the 5th round which is what David Wagner was doing on Saturday as his team went down 2-0 at Old Trafford.Huddersfield have now lost five Premier League games in a row to slip into the relegation zone while Birmingham have been climbing away from trouble in the Championship with four wins in their last six League games.I don’t know how many fans we’re expecting but I’m told that the incentive for the Birmingham fans to turn up tonight is to have a better chance of getting tickets for the game against Manchester United if they get there.

Millwall scored a 90th-minute equaliser to earn an replay against League One strugglers Rochdale.

Midfielder Ben Thompson found the bottom corner late on to deny Dale a place in the last 16. Jed Wallace had earlier put Millwall ahead from the penalty spot following a foul by Donervon Daniels.

But Ian Henderson curled in from 18 yards and Matt Done made it 2-1 to Dale with a tap-in at the back post before Thompson's late contribution.

Watch the highlights above.

Image source, Rex Features

Rochdale has had a bit of snowfall today but the League One's side game against Millwall is going ahead despite the conditions.

Lee: Come on you pies. We can do this got a good feeling! Coyp

Anon: No Bony or Fer in this one. Swansea got to win

After years of turmoil at Meadow Lane, the Magpies are flying high in League Two.

Can they knock out the Premier League strugglers?

Ellie Thomason
BBC Sport at the Liberty Stadium

There's no mention of fish or potatoes in Carlos Carvalhal's programme notes, but he is full of optimism.

"When I arrived,we were struggling to breathe. Then, we got some oxygen with the win against Watford and now we have a little more. So we are not almost dead anymore."

"We are still fighting in the FA Cup and have another chance to go through to the fifth round."

BBC One

Swansea's game against Notts County is live on BBC One and online from 20:00 GMT.

You can also listen to live commentary on that game on BBC Radio 5 live with Birmingham's game with Huddersfield on 5 live sports extra.

Swansea versus Notts County is one of three FA Cup fourth-round replays taking place tonight. Here's the full line up:

Birmingham v Huddersfield (19:45 GMT)

Rochdale v Millwall (19:45 GMT)

Swansea v Notts County (20:05 GMT)

Image source, Reuters

Carlos Carvalhal loves an unusual quote or too but comparing his players to fishes and potatoes has so far done the trick.

Since taking charge of Swansea at the end of 2017 he has overseen their rise out of the Premier League relegation zone, producing impressive wins against Liverpool and Arsenal along the way.

Tonight he faces a challenge of different kind. The Swans host League Two Notts County in their FA Cup fourth-round replay looking to avoid being on the wrong end of a giantkilling.

"A potato cannot play the role of fish."

"In an orchestra they have a saxophone, they have a piano and they have the drums. We have some players who must be the drums."

"If one Swan falls, another begins to fly."

Image source, Getty Images

If you are a fan of Carlos Carvalhal quotes or FA Cup upsets then we're sure to get one of those boxes ticked tonight.