Another decent chance for John McGinn. His shot is hit with pace but it's straight at Bernd Leno.

Moments later, Anwar El Ghazi has a pop and Leno is forced into action again.

Villa on top here!

Mason Mount's low cross on the left is almost poked in by Tammy Abraham before Joel Matip gets a desperate toe on it!

Dion Dublin
Former England striker on BBC Radio 5 Live

There are a lot of players slipping over and not being able to control the ball. It looks quite messy this game so far.

Willian chases a through ball on the right and almost gets there until Virgil van Dijk comes across and shoves him off it.

There's a few faint appeals for a penalty but referee Michael Oliver is having none of it. Good defending.

Image source, Reuters

There's a break from Arsenal and it's three-on-three. Pierre-Emerick Aubameyang is pushed wide so he tries to lift it into the centre.

Villa's defence keep it tight and it's well cleared.

Trent Alexander-Arnold's backheel flick retains possession as he and Jordan Henderson try to work something down the right.

It doesn't come off but Liverpool's high press immediately puts Chelsea under pressure and it's quickly back with Joel Matip.

Jordan Henderson curls a great ball into the box and Sadio Mane is running onto it. Cesar Azpilicueta has to make an important sliding clearance.

Image source, Getty Images

There's space for John McGinn on the edge of the Arsenal box but he drags his shot and it's a comfortable save for Bernd Leno.

Encouraging signs for Villa though.

Liverpool fans' "si senor" Roberto Firmino song is being sung loudly at Stamford Bridge as Virgil van Dijk comes in hard on Willian.

Pierre-Emerick Aubameyang almost gets in behind but Tyrone Mings is aware. He hooks it out for a throw-in just in time.

Moments later Bukayo Saka's cross is skewed way over the bar by Ainsley Maitland-Niles.

Phil McNulty
BBC Sport chief football writer at Stamford Bridge

Bit weird but a huge "Eden Hazard" banner being unfurled and stretched across The Matthew Harding Stand at Stamford Bridge - hasn't anyone told them he's gone?

And at the Emirates.

Off we go at Stamford Bridge!

Joshua Atkins: People slating Arsenal seem to be forgetting that we have 3 first team defenders missing at the moment. Holding, Bellerin and Tierney all add to this squad!

Anukram Adhikary: Will Emery ever learn how consistency in team selection is key to players’ understanding of one another, and how such understanding is key to success? Ozil dropped again. Torreira not starting again. Error prone Guendouzi starts again.

Chris Wise
BBC Radio 5 Live at the Emirates

He’s not even in the Arsenal squad list on the back of today’s programme, but number 77 Bukayo Saka starts in a Premier League game for the first time.

There’s a real buzz of excitement at the Emirates about what the 18 year old can bring to this side after a dazzling display in the Europa League during the week.

Image source, BBC Sport

Image source, BBC Sport

Only two of Liverpool's goals this season have been scored in the 80th minute or later (including the Super Cup victory over Chelsea). They tend to go early...

And here at the teams from the Emirates.

Image source, BBC Sport

Image source, BBC Sport

Here come the players at Stamford Bridge. A good atmosphere!

Image source, .

Image source, .

Alistair Bruce-Ball
BBC Radio 5 live commentator

Christian Pulisic has faded into the background a bit. My understanding is that actually he’s a quiet, shy lad and it must be tough to establish yourself, especially when you’ve been brought in to replace one of Chelsea’s best ever players for big money.

I think it’s just taking him time to get established but he is undoubtedly a good player.

Aston Villa

Aston Villa manager Dean Smith: "Any team is beatable, we saw that with Norwich's result against Manchester City.

"When you go head-to-head against anybody you've got to have that belief but we know how tough it is at the Emirates.

"We've got great belief in what our players are about and we saw with that trip to Tottenham that we can go toe-to-toe with these teams."