First real chance for Bournemouth as Ryan Fraser has a pop form distance. Wide, but not by much.

Jermaine Jenas
Former Tottenham midfielder on BBC One

I thought Norwich played pretty well in the first game, but they need to be more clinical in the final third if they have any chance of going through.

Antonio Conte will be thinking the only way we can lose this game is through complacency and Cesar Azpilicueta won't allow that.

Dafydd Pritchard
BBC Sport Wales at the Liberty Stadium

That was an excellent individual goal from Jordan Ayew, all the more remarkable given the fact he had messed up a far easier chance just moments earlier.

It is a less than electric atmosphere at the Liberty Stadium but that was one of the goals of the third round.

And now we are under way at Stamford Bridge.

The Video Assistant Referee (VAR) is in use for this game and this game only tonight. Let's see if it is needed for any big calls.

About to get under way at Stamford Bridge. Here's a reminder of how Chelsea and Norwich line up tonight.

Image source, .

Image source, .

Ian Walsh
Former Swansea and Wales striker on BBC Radio Wales

I have seen Wolves knock the ball around for the first time live this season and I'm impressed. They keep it simple and have pace up front. Wolves are making it very difficult as it looks like they have five at the back when they are defending with three in midfield and two up front.

BBC Radio 5 live sports extra

Burton Albion defender Stephen Warnock: "It looks like Bournemouth have gone for a back-four, a change from the back-three they played with against Arsenal, with Charlie Daniels slotting in at his traditional left-back slot, and with Ryan Fraser dropping in at right-back."

Dafydd Pritchard
BBC Sport Wales at the Liberty Stadium

The sparsely-populated Liberty Stadium is very quiet this evening, save for the large travelling contingent of Wolves fans who are gleefully goading their opponents with chants about the empty seats here.

With the teams making eight changes each, it's plain to see their priorities do not lie with the FA Cup.

it's icy cold in Wigan and it looks like a lot of fans have opted for warmth of staying indoors. Plenty of empty seats.

The hosts have the first attempt on goal, a weak low effort from distance by Gavin Massey straight at the keeper.

It's a wet and miserable Wednesday night at Swansea with the players struggling to get any pace behind the ball on a soaked pitch.

And we're under way in two of the three ties.

Tube troubles means Chelsea versus Norwich starts 15 minutes later.

Well the players are on the pitch in two of tonight's games - Wigan versus Bournemouth and Swansea versus Wolves. Seconds away from those games getting under way.

Dion Dublin
Ex-Norwich striker on BBC One at Stamford Bridge

James Maddison is the man at the moment. He can play as a 10 or an eight, he’ll take all the corners and free-kicks. He’s not particularly fast or strong but he’s intelligent. Without putting them in the same bracket, he’s like Christian Eriksen at Spurs. If he plays well, the rest of the Norwich players will follow suit. There's a lot of pressure on him.

Gianfranco Zola
Former Chelsea forward on BBC One

I saw the Leicester game and Leicester were really good to be fair. Chelsea were tired a bit but that doesn’t surprise me as the schedule is tight. Eden Hazard was low in stamina, he was trying to do things but nothing was coming alive for him.

BBC Radio 5 live sports extra

Burton Albion defender Stephen Warnock: "A lot of changes have been made by both teams, so it could be one of those games where it needs a bit of a spark to get it going.

But then again, there's a lot of fringe players on show, so they'll be looking to impress tonight."

Norwich boss Daniel Farke, speaking to BBC Sport: "We are not the favourites today so we can enjoy this game. January is always a bit annoying, it is not easy to focus the players on the playing side. We lost a key player but sometimes we have to accept this.

"It is quite normal when you face an opponent with high individual quality, you need a bit of luck, we will see what develops."

Ian Walsh
Former Swansea and Wales striker on BBC Radio Wales

If I was the Swansea manager I would be taking this game very seriously. Even though they have had good away performances in terms of gathering points, he needs to look at getting his best team for the end of the season and a cup run will help that.

The way you find consistency, you keep playing a regular side. I hope Carvalhal has taken it seriously as I think this is a big game in Swansea's season.

Image source, Theo Walcott/Twitter

The big news in the transfer market today was Theo Walcott making a £20m move to Sam Allardyce's Everton.

End of an era, with Walcott having been at Arsenal since 2006.

A good signing for the Toffees in my book.