Alan Shearer
Former England captain on BBC One

It is a huge game. It is the start of such an important six-day period for both football clubs and for both managers.

From a Chelsea point of view Sarri is about to find out if his players want him to stay in the job.

Image source, Getty Images

The draw for the FA Cup quarter-finals will take place live on BBC One following tonight's game. Remember, we could have extra time and penalties!

The ties will be played from 15-18 March, with winning clubs receiving £720,000 in prize money.

The draw will be made by Darren Fletcher, part of the United side that won the competition in 2004, and Wayne Bridge, who lifted the trophy with Chelsea in 2007.

'If he doesn't put Kante back in the middle, I want him to go' is the view of one fan in a voxpop outside the ground.

Prepare to be unhappy, sir.

Manchester United

Image source, Getty Images

Saudi Arabia Crown Prince Mohammed Bin Salman's media minister has denied reports linking him with a £3.8bn takeover of Manchester United.

Rumours of his interest resurfaced over the weekend, external, although reports suggest the Glazers are not looking to sell., external

United's American owners bought the club for £790m in May 2005.

"Reports claiming that HRH the Crown Prince Mohammed Bin Salman intends on buying Manchester United are completely false," said Turki al-Shabanah.

What was the alternative Jack? Sanchez?

There are only a few hours left to sign up for the 2019 FA People's Cup!

It will feature teams like this lot...

Sign up here, external - either as a team or on your own - before midnight!

There have been some great games and goals in their previous FA Cup meetings over the past 20 years - but which is your favourite?

Watch the goals and then choose which one you think is best by voting here.

Dan Roan
BBC Sports editor

Leeds Utd fined £200,000 for spying on a Derby County training session. Also receive a formal reprimand and warning to the effect that the club’s conduct fell significantly short of the standards expected by the EFL and must not be repeated.

Steve Wilson
Match of the Day commentator

Image source, Getty Images

Football, they say, is cyclical, so perhaps it should be no surprise that Chelsea and Manchester United meet in a repeat of last season's FA Cup final.

From Stamford Bridge to Old Trafford - via Wembley and Moscow - this is English football's most played fixture of recent times.

Chelsea, of course, won last season's final and the Blues haven't been knocked out of a domestic cup competition by Manchester United since 2002.

Back then Ole Gunnar Solskjaer still had a big chunk of his playing career ahead of him, and Maurizio Sarri had not long given up banking to concentrate on coaching Sansovino in Italy's fourth tier.

As the two men shake hands at Stamford Bridge, one could be wondering what will happen to him at the season's end - and the other pondering whether he will even last that long.

Watch the quirkier moments from the FA Cup fifth round, including last-gasp goalkeeping antics, a superb solo goal from Swansea's Daniel James, and a contender for miss of the round from Brentford's Neal Maupay.

Watch all the FA Cup fifth-round goals here.

BBC One

Yes, we have full coverage of tonight's big game live on BBC One, iPlayer and at the top of this very page.

Just press play now!

You can join Gary Lineker, Jimmy Floyd Hasselbaink, Alan Shearer and Phil Neville from Stamford Bridge.

Will Gary make his usual gag...?

Darren Fletcher
Former Man Utd midfielder

Image source, Getty Images

Paris St-Germain did a superb job on United's midfield last week, playing five in the middle with Marquinhos tracking Paul Pogba to stifle him completely.

N'Golo Kante is the only Chelsea player who might try to do the same thing, but I can't see it happening.

When 'Sarri-ball' is questioned, it is usually his use of Kante in a more advanced role that is brought up, but we have to remember he is not and has never been used in the Makelele role while in the Premier League.

In any case, Sarri wants something different from his holding midfielder.

Jorginho is there to play the Andrea Pirlo role or, as it is known in Italy, the 'Regista'. He is not there to tackle and break play up, he is there as a deep-lying playmaker.

Manchester United’s Alexis Sanchez has been involved in 19 goals in 20 FA Cup games (10 goals, nine assists) – more than any other player since his first appearance in the competition.

He's only on the bench tonight though.

Image source, BBC Sport

Calling all football superfans...fancy doing some FA Cup detective work for us?

We've been given a whole load of facts, stats, records and memories from the most famous domestic tournament in the world, but it appears that not all of them are true

We need some top football detectives to read through the statements and pick out the lies for us... think you've got what it takes?

Take part here!

He might not be playing, but Manchester United's Alexis Sanchez and Ander Herrera did find time this week to undergo some quick-fire questions from Guillem Balague.

You can get in touch with us via the usual channels - like Nathan here...

Nathan House: United going out tonight must be part of OGS’s masterplan. Why else drop the best goalkeeper on the planet? Made things real hard for ourselves now, Chelsea’s attackers will have a right spring in their step.