Here we go then - the teams are in the tunnel. Wayne Rooney's eyes are set dead ahead. Let's do this!

Manchester United fans Josh, Nathan and Dave speaking to us outside Old Trafford. Nathan (centre) says. "The FA Cup is more important than the top four to me. Why? I don't want us to become like Arsenal: reaching the Champions League but winning no trophies. This club is all about silverware.

"Wayne Rooney has a great goalscoring record against Arsenal and I think he'll score twice in a 2-1 win, so long as he plays up front. Playing him in midfield is pointless."

Manchester United manager Louis van Gaal: "What's the plan? That we beat Arsenal! That's the most important thing in a Cup tie. Arsenal are one of the best teams in the Premier League but I have noticed that they have played more defensively lately. With a lot of success.

"It is not so easy to recover from an injury for Michael Carrick and then play in a Cup tie. Daley Blind is doing well and Ander Herrera too. Carrick has to wait.

"I have been to Wembley as a spectator but not as a coach and that is more interesting."

BBC Red Button

Image source, Getty Images

Just to give you even more options tonight, TV viewers can watch with BBC radio 5 live commentary if they press their Red Button once the action is under way.

What was so special about the games between Arsenal and Manchester United 10 years ago? That's the question Gary Lineker puts to the panel.

"I hated Roy Keane. Hated him," says Ian Wright. A nervous glance to his right. "I don't hate him now..."

In his interview with Martin Keown last week Arsene Wenger said that he still regrets the defeat at Old Trafford which ended his Arsenal side's unbeaten run at 49 games. As 50 is a landmark which would have stood forever.

Forty-nine games unbeaten! Incredible to look back on that now.

Ian Wright on Match of the Day
BBC Sport

"When you look at their win against Manchester City a while back, everyone thought a change had happened to Arsenal. Since then we haven't seen anything like that again. Arsenal haven't been fluent. This is the kind of big game where you want Arsenal to put down a marker."

Match of the Day

Former Manchester United captain Roy Keane: "I've not been surprised by where United are currently under Louis van Gaal. There's been so many changes over the years at the club, it's expected. Lots of experienced players leaving and people shouldn't be surprised at where they're at.

"There's been progress over the last few months. People are obsessed with getting in to the top four, but you also need to win trophies.

"What's helping is they're getting decent results, performances haven't been great, and the fans would like some quicker play in the final third."

Image source, Getty Images

Kick-off just 10 minutes away now. This has got to be a good game, it just has to be. Right?

BBC Radio 5 live

Tonight's match is also live on BBC Radio 5 live and Kelly Cates will have all the latest football debate and build-up from Old Trafford in the Monday Night Club from 19:00 GMT.

Guests include Phil Neville, Martin Keown and 5 live commentators John Murray and Alan Green.

The draw for the semi-finals will take place on BBC1 at around 21.45 GMT, 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 Manchester United or Arsenal

4 Aston Villa

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

Shohidur Rahman: I'm really surprised Michael Carrick isn't starting. For me when he's fit, he's a guaranteed starter. Also would've started Falcao.

Match of the Day

Here we go then. Live on BBC One and at the top of this page.

Press play now!

Arsenal fans James and Mohsin, speaking to our reporter Alistair Magowan outside Old Trafford. James (left) says "I don't think we've beaten Manchester United at Old Trafford since 2006, but you've still got to come along and show the faith.

"I'm the same with Arsene Wenger. I don't think we've stagnated under him. He's bought in some talented players in Mesut Ozil and Alexis Sanchez, but he needs to sign more than one top-class player each season, like Chelsea and Manchester City."

Mohsin (right) says: "I'd take the FA Cup again this year over the top four. I'm fed up of fourth place being seen as a trophy and let's face it, we're not going to win the Champions League. Hopefully, though, a win here can give us hope for the European tie against Monaco."

Marouane Fellaini is not the most popular man in Manchester is he? You'll change your tune should he scramble in a late winner...

Andy Daly: Reasonably happy with that #MUFC lineup, but I wonder how Mata & Januzaj feel sitting on the bench when Fellaini is in 1st XI?

Marv Andre Khala: Rafael and Mata should be starting. I don't like this idea of starting with Fellaini as a striker.

Aniekan Inyang: Gunners to hurt Utd with pace.

Phil McNulty
BBC Sport chief football writer at Old Trafford

Image source, Getty Images

"Arsenal have a dismal record against Manchester United in recent years. They have not won at Old Trafford since 2006 and United have won 11 and lost only one of the last 15 meetings in all competitions.

"United have not sparkled this season under Louis van Gaal, although they have been grinding out results - is the time right for the Gunners to finally change the storyline of this fixture?"

'Get stuck in' says Roy Keane as Gary Lineker goes through his lines in the Match of the Day studio.

'That's what I want, tackles flying in' adds Ian Wright. Kick-off is 20 minutes away, and live BBC One coverage is now seven minutes away.

Big news from Old Trafford - Roy Keane is smiling! The ex-Man Utd captain is in position and he looks like he's having a great time alongside Alan Shearer as the pair have a bit of a chinwag. Just like old times.

Image source, AP

Luke A Howell: Utd 3 Arsenal 2, not the score line, number of Brits on display.

Colin Groom: Two unanswered questions. Will Ozil finally turn up in a big game for Arsenal? Has Wenger mastered a zip?

Tom Bradshaw: So nervous, not because United are good but because they're lucky and you can't train for that.