Chelsea's Ben Chilwell is almost set off down the left flank but the ball over the top is too long.

Plenty of endeavour from Sheffield United so far as Chelsea patiently probe.

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

One thing I've noticed already is Sheffield United cannot allow Gilmour and Kovacic to control the pace of the game - otherwise it's going to be a long, long afternoon. They have to really close those two down and put them under pressure. Don't let them dictate the pace.

Plenty of steel from Sheffield United in the opening few minutes as they try to unsettle Chelsea. Oli McBurnie whacks Mateo Kovacic and concedes a free-kick.

Chelsea whizzkid Billy Gilmour is caught late by Blades counterpart John Fleck. No quarter given from one Scot to another there.

The home side are starting to settle. Ball on the deck. More salmon in the Sheffield United half than the Atlantic.

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

It's a great start from Sheffield United. If I was them, I would be pushing and pressing Chelsea from the get go. Just put them under pressure. See what you get out of them.

Sheffield United have got nothing to lose and David McGoldrick illustrates that with a speculative shot. On target but easily gathered by Kepa.

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

For these Sheffield United players today, they should play with a sense of freedom, carefree - and that's sometimes the best way to play.

The players have nothing to lose, the underdog mentality and for some of them, it's an audition. If they want to stay at this level - if they play well - someone might come and pick them up next year. They could be playing Premier League football next year, instead of in the Championship.

Game on! Blades get us going.

Chelsea: Arrizabalaga, Christensen, Zouma, Chilwell, Hudson-Odoi, Kovacic, Gilmour, Emerson Palmieri, Mount, Pulisic, Giroud.

Subs: Rudiger, Alonso, Kante, Werner, Caballero, Ziyech, James, Azpilicueta, Havertz.

Sheff Utd: Ramsdale, Baldock, Jagielka, Stevens, Osborn, Bogle, Lundstram, Norwood, Fleck, McGoldrick, McBurnie.

Subs: Mousset, Lowe, Burke, Foderingham, Brewster, Bryan, Brunt, Gordon, Ndiaye.

Referee: Andrew Madley (West Yorkshire)

All sorts of confusion earlier about the Chelsea team. Let's have one more reminder about the two sides...

Ska classic The Liquidator is booming out at the Bridge. You know what that means... the teams are strolling out into the west London sunshine.

Sheffield United

Sheffield United interim manager Paul Heckingbottom speaking to BBC One: "We know it will be a tough task - the form Chelsea have been in has been great and that's whatever XI they put out in whatever competition.

"We know we'll have to be at our best and take whatever opportunities we can take but we have to be ruthless at one end and be clinical and try and let through as little as possible at the other end. It's a big opportunity for us but it's going to be a tough game."

I love the fact the Sheffield United manager sounds like Sean Bean. Let's gloss over he played for Wednesday.

Micah Richards
Former Man City defender on BBC One

The first season in the Premier League no one expected what Sheffield United did - but sometimes teams work you out. It's different today because it's a cup and you can put the league aside. Anything can happen because it's the FA Cup so I'm looking forward to seeing what will happen.

Michael Duberry
Former Leeds defender on BBC Radio 5 Live

I think the magic of the FA Cup has come back and don't think this is an easy walk through for Chelsea. I think they will have to work hard to get through this tie.

The changes to Sheffield United have been enforced through injuries but for Chelsea, I'm never a fan of so many changes in one team. I think it can be a little bit disruptive.

It'll be interesting to see if they can just blend in and carry on in this Chelsea team. It'll take time to find the rhythm.

Sheffield United were mauled by Leicester last week in their first game without Chris Wilder in charge.

Wilder didn't lose his job because he had lost the dressing room - far from it - and the Blades looked like a team who have just had the heart ripped out of their club.

They are not going to bounce back here, either. Chelsea might not be too exciting to watch under Thomas Tuchel but they know how to get the job done.

Prediction: 2-0

Lawro's full predictions v racing driver Billy Monger

Little under 10 minutes until kick-off at the Bridge. Forgot to remind you all earlier... the tie will be done and dusted today, with extra-time and penalties if needed.

Lawro doesn't think that will be necessary...

Strong overcoat game going on at the Bridge. Buy-one-get-two-free-from-a-catalogue vibe going on for Micah Richards, Ashley Cole and Michael Brown.

Gabby Logan showing them the way in sartorial elegance.