81,000 inside Wembley for this - around 12,000 more than yesterday.

150,000-plus over the weekend.

Image source, EPA

Image source, PA Media

Image source, PA Media

Brighton's fans have not stopped singing all afternoon. They might need their voices for a further 30 minutes.

Wembley is on tenterhooks.

United are on the charge. Antony and Bruno Fernandes are involved but in the end it is an easy claim for Brighton's keeper Robert Sanchez. Extra time is looming.

That's the end of Danny Welbeck's afternoon. The good news is he is able to walk off the pitch unaided. His replacement is Deniz Undav.

Image source, Reuters

Danny Welbeck falls awkwardly inside the United box after a challenge by Victor Lindelof. An honest challenge by the United player but Welbeck is hurt.

Danny Murphy
Former England midfielder on BBC One

Both managers will be a bit disappointed that they haven't got a full-strength squad because they are limited on attacking options from the bench.

Brighton have had 62% possession, 10 attempts, three on target. They're full of energy.

Danny Murphy
Former England midfielder on BBC One

It has been a good period for Manchester United. They've got into some good positions but they've lacked that killer instinct to make the difference.

Image source, Getty Images

Tim: Probably an unpopular opinion but I would have started Weghorst instead of Martial. Would have given us more energy up front and probably just as much a goal threat as Martial.

Ayush: Martial has had a really poor game. He’s not pressing and he’s not staying high as an outlet for Man Utd. So I’m not sure what he’s offering at the moment.

This has been a breathless second half. Very different to the first 45 minutes. Neither side will really want extra time with both in action in midweek, but there's a huge prize on offer.

Danny Murphy
Former England midfielder on BBC One

Enciso has really tried to make things happen. He's showed his skill and tried to be courageous.

It makes sense though that De Zerbi has turned to the more expeirenced Veltman.

Image source, Reuters

A change for Brighton with the tie on a knife-edge. Julio Enciso, who has gone close, is replaced by Joel Veltman.

Danny Murphy
Former England midfielder on BBC One

Not the best from Fernandes. He didn't set the free kick out high enough or wide enough and you can see he's annoyed with himself.

Up steps Fernandes. Straight into the blue and white wall. It rebounds back to the captain who launches it over the bar to huge cheers from Brighton's fans.

Image source, Getty Images

Marcus Rashford is sent sprawling on the edge of the Brighton box.

Free-kick. This is made for Bruno Fernandes.

Danny Murphy
Former England midfielder on BBC One

Antony has got into great positions on two or three occasions but just not been able to get the right kind of shot away.

He's better than that.

Brighton play it out from the back but lose possession. Then Antony spots an opening and tests Robert Sánchez who has to get down quickly to push it away.

This tie has well and truly come alive.

Chances at both ends but now play is stopped after Julio Enciso goes down.

That allows Erik ten Hag to make his first change. Fred is on for Christian Eriksen.

Image source, Reuters

United are on a rare attack through Antony but his final finish is straight at Robert Sanchez. Brighton respond through Solly March who forces a save from a tight angle.

It's end to end.