Changes at Brentford too.

Maxwell Haygarth is on for Lewis Gordon and Charlie Goode replaces Halil Dervisoglu.

Mustapha Olagunju is finally off and by Huddersfield's own choice rather than the referee's. He's been walking a tightrope for at least half an hour.

Few changes for both sides.

Sweeping move from Arsenal as they work it left for Bukayo Saka in space, but his attempted cross is too close to Martin Dubravka and the goalkeeper gathers.

Saka is in again on the left moments later but Newcastle do well to get bodies back and Ciaran Clark hacks away.

Simon Stone
BBC Sport at Old Trafford

With coronavirus cases across the country rising, Sam Allardyce talking about a two-week circuit breaker and Steve Bruce questioning the morality of football continuing, it feels like the game is on a knife-edge.

Manchester United manager Ole Gunnar Solskjaer is very much in the 'keep going' camp, believing the game offers fans some much-needed respite from the serious stuff happening elsewhere.

But Solskjaer is aware there is a responsibility, which he spells out in his programme notes tonight.

"We recognise within the football industry we are privileged to have a degree of normality in our lives, when so many don't have that luxury and we are all very mindful of working hard to stay within the rules and guidelines we have been set," he said.

"Tonight. I hope we can do our bit to help brighten up your day."

Mustapha Olagunju has to be really careful. He gets away with a second yellow when his boot is high and Plymouth get a free-kick in a decent position.

Ben Hamer has to make a smart save at the near post.

A few moments ago, Rolando Aarons came on to replace Patrick Jones for Huddersfield too.

Danny Murphy
Former Liverpool and England midfielder on BBC One

In a cup competition the performance is obviously less important than the result but Mikel Arteta would've liked some of the players that haven't been playing recently to show a little bit more, give him a problem - and they haven't done.

Hang on... penalty shout for Arsenal? Pierre-Emerick Aubameyang goes down in a challenge with Ciaran Clark but VAR says there's nothing in it.

Patrick Roberts cuts inside off the right and drills it low but it's fairly comfortable for the keeper, despite him seeing it late.

He gets two hands on it and turns it around the post.

Jacob Murphy is released with a ball in behind the Arsenal defence and his cross is good. Andy Carroll latches on to it but David Luiz does well to put enough pressure on the forward to stop him getting a decent effort away.

Tom: Finally a decent VAR decision. Imagine wailing like a banshee and rolling half way off the pitch after such minimal contact though. Longstaff wants booking for simulation.

Nick: I'd be interested to see where the ref was looking where that tackle went in. Even first time round it looked like nothing. Guided by the scream, or by Arsenal's recent disciplinary record?

Michael Smith: So is VAR Good or bad again today? It's hard to keep up

Danny Murphy
Former Liverpool and England midfielder on BBC One

We've talked about the performance of Andy Carroll but I think Isaac Hayden and Ciaran Clark have been fantastic as well for Newcastle.

What a hit! What a save!

Granit Xhaka strikes a dipping volley superbly from the edge of the box and it forces Martin Dubravka into a flying stop.

Patrick Jones tries to get the better of Will Aimson but the Plymouth defender just holds him off.

Jones goes down but it's a free-kick the other way.

Poor diagonal ball in his own third from David Luiz and Jacob Murphy gathers before being crowded out in the penalty box. Emile Smith Rowe has half a chance at the other end as Arsenal break but it comes to nothing.

Very quiet in this game. I jinxed it by saying there was more goals...

Hayden Coulson thinks he's clipped in the box but there's nothing in it.

Half an hour for either side to find a winner.

Imran: Those 2 big chances for Andy Carroll will come back to haunt Newcastle

Adrian: Nooooooo! Not another half an hour of this. Can we skip ET?

Mike Hall: Red card? That was barely a foul. I think that the referee got bored.

George: Both sides had their chances in that half. Newcastle’s were probably more clear cut, but Aubameyang could have got a couple. Pepe has had another poor game if you ask me

Paul: Are we going to criticise Longstaff for his pathetic scream and 2 or 3 rolls over a foul that wasn't even a bad foul? Absolutely pathetic. Good job it got overturned.