Luce: Every single Chelsea substitute has been like for like. 2-0 down and Sarri can't change the game. Same boring match, all possession nothing to show for it. Chelsea have been poor tonight but that comes from the poor tactics & poor game management by Sarri

John Bennett
BBC World Service

If you’re Hudson-Odoi & Zappacosta comes on instead of you at 2-0 down I think you’d be going home tonight & checking out flats in central Munich on the internet.

Chelsea have a corner, cleared. United almost counter, they've looked like scoring from every one of Chelsea's corners this evening...

1. Wolverhampton Wanderers

2. Millwall

3. Crystal Palace

4. Manchester City

5. Chelsea or Manchester United

6. Swansea City

7. Watford

8. Brighton & Hove Albion

This is a very comfortable second half for Manchester United. Chelsea make a third change, a rather pointless one to be honest as Davide Zappacosta comes on for Cesar Azpilicueta.

That call has gone down like a lead balloon...

Image source, Reuters

If Chelsea sack Sarri and United appoint Solskjaer we may never go home tonight...

Martin Keown
Former Arsenal defender on BBC One

If Man Utd see this through then Solskjaer should be given the job tonight.

Image source, .

Who has impressed you so far? Rate the players out of 10 here.

Chelsea haven't had a shot on target since the 11th minute of this match.

Image source, Reuters

Karen Carney
Chelsea women's winger on BBC Radio 5 live

It’s getting progressively worse. If I know I’m getting hauled off after 60 mintues of every game, that’ll mess with my head. They’re in a little bit of a rut.

At least they’ve thrown a bit of fight but they’ve left it too late in this game. It’s a season-defining week for Chelsea. I don’t want to see anyone get sacked.

'You're getting sacked in the morning' rings out from the stands. Could be United fans, could be Chelsea. I couldn't tell you.

See my entry at 21:01...

Richard Cumiskey: I think the frustrating thing for a Chelsea fan must be they have all of this quality, all of the ball yet there is no clear plan. It just feels like they are attacking because they have to.

Usman Khalid: Sarri stubbornness costing Chelsea a heavy price, no matter why he never won anything in his career.

Arron Newble: Just go Sarri. Killing my club. Dull, predictable, lifeless approach + substitutions by numbers every game. Hopeless.

Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live

Sarri won’t survive tonight. Well he might until 9am tomorrow. If he does survive tonight, do you have to question the owner's ambition?

I remember Sarri saying we'll be better in the second half of the season. He’s done himself so much damage with the things he’s said. You can’t be beaten 4-0 by Bournemouth and humiliated by Man City. He signed Jorginho. They’re a one-trick pony.

Image source, PA

On behalf of the late shift at BBC Sport HQ, can Chelsea wait until at least the morning?

Lee Dixon
Former Arsenal and England defender on BBC Radio 5 live

This crowd is right on the tipping point. Another goal goes in and Maurizio Sarri might go tonight.

Martin Keown
Former Arsenal defender on BBC One

The Manchester United players are like street fighters. Alexis Sanchez has picked up the pace straight away.

Sporting applause from the Chelsea fans as Juan Mata comes off - on comes Andreas Pereira.

John O'Shea
Former Manchester United defender on BBC Radio 5 live

Eden Hazard is going to be at Real Madrid in the summer, it's fairly clear it's heading that way.

Image source, Reuters

Prior to tonight, Chelsea have only failed to score in one of their last 50 cup ties at Stamford Bridge - this was in the 2017-18 League Cup semi-final vs Arsenal (0-0).