Phil Neville
Match of the Day, BBC Sport

"I think United lost the game in midfield. Arsenal were too quick for them in there. Daley Blind really struggled and Welbeck sat deep to protect Arsenal when they didn't have the ball."

Roy Keane
Match of the Day, BBC Sport

Image source, AP

"I think David De Gea's the best goalkeeper in the world at the moment. But for United, it's not a good sign at the moment when he's getting man of the match most weeks."

Some landmark news to announce too, The FA Women's Cup final 2015 will be played at Wembley Stadium this year for the first time. It will be held on 1 August 2015 and the BBC will bring it all to you live.

That last-minute save from David De Gea to deny Alexis Sanchez was absolutely sensational.

Roy Keane
Match of the Day, BBC Sport

Image source, PA

"Louis van Gaal's going to be criticised after the game, but you've got to give him a chance.

"It takes time, he's only been in the door five minutes.

"A lot of fans don't understand the game and how much of a challenge it is to run a club the size of Man United. They should've given David Moyes more time, but they didn't."

Neal Collins: Certainly looks like an @Arsenal v @LFC final, remember Charlie George, 1971? I named my first dog after him!

Joe Davies: Looks like #Gerrard's dream career ending is still on then. Looking like #Liverpool v #Arsenal for the #FACup final at #Wembley.

Arsenal manager Arsene Wenger: "Last year we played a tricky game at Wembley in the semi-final and we expect that again. Tonight I thought we played well and deserved to win the game.

"We had to start without apprehension and play at a a high pace and we did that well. Danny Welbeck, I believe is just happy to score. He worked extremely hard today and deserved his goal.

"We live in the real world and want to compete in every competition. This result can give us good morale for the Premier League and the game in Monaco."

Arsenal will fancy their chances against either Reading or Bradford City at Wembley - but don't forget that Bradford knocked Arsenal out of the League Cup just two years ago.

Liz Tray: Poor United. Without De Gea it'd have been worse. My heart bleeds for them and their 20 titles. Still, there's always the Europa League?

Victor Chatfield: Lots of decisions went Arsenal's way. Adnan Januzaj lost his balance and didn't seem to appeal. No foul, but no dive either. Lucky Arsenal.

Image source, cruser

Fresh from helping conduct this evening's draw, Dermot O'Leary is dancing non-stop for 24 hours on Thursday to raise money for Red Nose Day 2015.

He's be live from the piazza at BBC's New Broadcasting House and dance live all the way into London's Palladium where the night of Red Nose Day TV is being filmed.

He needs the public to sponsor him by texting DERMOT to 70005 to donate £5 (cost £5 plus standard network rate) or by visiting the Red Nose day website. , external

You can follow the action live on BBC Radio 2 and on the BBC Red Button.

Roy Keane
Match of the Day, BBC Sport

"I think it's important to celebrate the goal for Danny Welbeck. Yes, he's a local boy, but he's got to do his best for Arsenal."

David Lee Starr: Man Utd players let us down. Took a sending off to show some spirit. Not good enough

Mic Medeska: United supporter here. Michael Oliver was spot on perfect today. No complaints there.

Luke: De Gea is going to get fed up with saving United week in week out. Ronaldo got fed up. Real Madrid in the summer is odds on.

Happy with that Arsenal fans?

Aston Villa v Liverpool or Blackburn Rovers

Bradford City or Reading v Arsenal

Here comes the draw with ex-United keeper Peter Schmeichel and presenter Dermot O'Leary picking the balls.

The numbers to look out for will be:

1 Liverpool or Blackburn Rovers

2 Bradford City or Reading

3 Arsenal

4 Aston Villa

The semi-final ties are to be played on 18 and 19 April.

Roy Keane
Match of the Day, BBC Sport

"Shocking defending for the second goal. Phil Jones had time to clear, he can do better, the goalkeeper could've sacrificed himself there and Danny Welbeck had read the poor back pass."

Ian Wright on Match of the Day
BBC Sport

"Danny Welbeck was in the right place for Antonio Valencia's mistake, but Arsenal didn't have much to do. I don't think Manchester United had too many ideas. It was a lot easier for Arsenal than they would have expected."

The BBC pundits are all in agreement that Danny Welbeck should have celebrated his goal. That's a trend we need to see come back isn't it?

Phil Neville
BBC Radio 5 live

"It was a brilliant performance from Arsenal, such speed in the counter-attacks and United couldn't cope with the speed in those midfield interchanges. Arsenal would've had two or three goals in that second-half had it not been for David De Gea."