Amid that frantic spell, Emile Smith Rowe did replace Reiss Nelson. The young playmaker hasn't had much chance to get on the ball though as it is Newcastle who are dominating possession and territory at the moment.

Danny Murphy
Former Liverpool and England midfielder on BBC One

The game is getting a little bit stretched now. I don't think either manager would appreciate extra time.

All square at the break.

A stretcher has been brought out for Marcus Browne. Doesn't look good at all. Neil Warnock has walked over to see how serious it is and his team-mates are gathered around.

He's taking oxygen on board.

Sam Folarin is warming up on the touchline and will be coming on.

Plymouth are trying to walk it in. Getting into some good positions in and around the box but just can't seem to get a shot away.

Kassim Patel: How bad is Willian though.

Chance for Pierre-Emerick Aubameyang at the other end! Mohamed Elneny threads a lovely pass into the path of the Gunners forward and he clips it over the onrushing Martin Dubravka but wide of the target.

Mads Roerslev Rasmussen looks to beat Marcus Browne on the right but the Middlesbrough man uses his body to stop him getting around.

Browne then goes down immediately clutching his knee and looks in some pain as the medical staff come on to give him some treatment.

Andy Reid
Ex-Republic of Ireland midfielder on BBC Radio 5 Live

Carroll should have scored. He a long way onside and that is a really big miss.

He has been good, has been a handful and it came to him nicely on his left foot. You are just waiting for the back of the net to ripple there, but it is a poor miss.

Andy Carroll is involved in everything at the moment. He gathers the ball on the turn, halfway inside the Arsenal half, doesn't fancy his chances of beating David Luiz for pace so opts to have a dig from distance instead, but it's well closed down.

Newcastle have been the better team since the break.

Goalscorer Aaron Rowe is having a good time. He gets away on the right and forces another save from the Plymouth keeper but it's a fairly comfortable one. Hit straight at him.

Danny Murphy
Former Liverpool and England midfielder on BBC One

Andy Carroll was in there again. Poor clearance from Kieran Tierney. He's actually onside. Wow. Best chance of the evening.

Arsenal are giving away free-kicks in dangerous positions. They're even more dangerous when you have Andy Carroll lurking in the box.

Matt Ritchie's ball floats over everyone but it's turned back in and an unmarked Carroll fires wide of an almost open goal. Somehow!

He's flagged offside, but the replay shows the forward was on - it would have stood.

What a chance for the visitors.

That goal has woken Middlesbrough up a bit. They are pressing high and Luke Daniels has to hastily clear it under pressure from Chuba Akpom.

Danny Murphy
Former Liverpool and England midfielder on BBC One

I can see Emile Smith Rowe getting ready. That's exciting, he's been superb the last few weeks.

Fizzing effort from Andy Carroll, and Bernd Leno has to be alert to stop it.

The Newcastle forward is such a nuisance and brings the ball down on his chest before unleashing a right-footed effort from the edge of the box.

Sheffield United

Sheffield United manager Chris Wilder: "I am pleased for the players and most importantly the supporters.

"I think we have seen a performance today that wasn't free-flowing. It was always going to be a tough cup tie, away from home and not being in form at all. It was against a team with nothing to lose and we had everything to lose today.

"Everybody in the country would have sniffed this. Every expert, pundit and supporter wouldn't have been surprised if we were turned over today. But there was a good attitude.

"This was a big day for us, because of what's happened, it's been a tough week. This was a big fixture and a big result, it won't feel like that to anybody but hopefully we can build on it.

"The consequences of not getting a result today would have really impacted on the group. The players have taken a lot. A lot of players there played in the Championship when we went up. There are young players out there as well and when you don't get results it does test everybody out."