BBC One

Tonight's match is live on BBC One and you can see every kick, tackle and hopefully goal live from Old Trafford from 19:30 GMT.

Gary Lineker will be joined by a heavyweight panel of pundits including Roy Keane, Alan Shearer and Ian Wright.

Yes that's right - Roy Keane sitting next to Alan Shearer. This could be interesting.

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Image source, BBC Sport

Commentary comes from Guy Mowbray and Danny Murphy.

Phil McNulty
BBC Sport chief football writer at Old Trafford

Image source, BBC Sport

"All quiet at Old Trafford - for now. Man Utd v Arsenal. FA Cup quarter-final."

BBC Sport pundit Robbie Savage

"The reason there was such a buzz when United bought Angel Di Maria from Real Madrid in August is that he was up there with the best players in the world.

"He was man of the match in last season's Champions League final, which Real won, and he had a great World Cup. The very best players in the world are able to grab games by the scruff of the neck and lift their team when they are not playing well.

"Alexis Sanchez has been a great example of that with the way he has regularly made things happen for Arsenal on the days when they have been average and have needed his help to help set the tempo in attack.

"There is no way you could say that Di Maria has done the same for United while they have been short of their best form.

"Yes he still works hard but, if anything, his performances have been getting worse, not better."

Read more from Robbie here.

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Goonerama: Re: former player to bring back - it's got to be Vieira. Titan. Giant. Colossus. Just what we need in CM right now

Abdulahi: Patrick Vieira, self-explanatory.

Manchester United fans Sheldon and Marsha have been talking to our reporter Alistair Magowan outside Old Trafford.

Sheldon (left) says: "This is a big game for both clubs and their managers because it can provide a springboard for the rest of the season.

"I'm not totally convinced by some of Louis Van Gaal's decisions so far but as much as I'd like us to taste glory in the FA Cup and go to Wembley, I understand what the manager is saying by wanting to reach the Champions League next season. Both are important."

Image source, Reuters

Manchester United boss Louis van Gaal says a top four Premier League place is more important than winning the FA Cup.

United are currently in fourth in the top flight - a point behind Arsenal - and haven't won the FA Cup since 2004.

Van Gaal said: "To finish in the first four is a fantastic result and for us at Manchester United even more I think.

"If you win the FA Cup you are not in the Champions League but you have won a title."

What do you reckon? Are both possible?

The current Arsenal team are at Old Trafford, former United man Danny Welbeck leading the way. He should know where he's going...

All this talk of Mikael Silvestre's team selections has got us looking back at the past.

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Which former Manchester United or Arsenal player would you most like to bring back into the current side, and why?

Would Bryan Robson sort out the Old Trafford midfield? Could Marc Overmars add the spark that's missing at the Emirates? George Best? John Jensen?

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Let us know at #bbcfacup, external, pop on to the BBC Sport Facebook page, external or BBC Sport's Google+ area., external

You can also text us on 81111 in the UK only - don't forget to say who you are and where you are texting from.

It's a similar story for Arsenal. Ten years ago they had just gone unbeaten for a whole season, so perhaps the only way was down from there.

Thierry Henry is not included - he was injured for the 2005 final. If he was available he's a shoo-in, which could see Alexis Sanchez miss out. He's one of only two current players in the team, with Laurent Koscielny getting the nod at the back ahead of Philippe Senderos.

Are both teams worse than a decade ago?

First of all, Mikael Silvestre has picked himself in the combined United side. And let's face it, we'd all do the same if we could.

The only players from the current side to get a look in are goalkeeper David De Gea, captain Wayne Rooney and British transfer record signing Angel Di Maria.

Roy Keane, Cristiano Ronaldo and Paul Scholes have proved irreplaceable...

These sides met in the final in 2005, a dour game settled on penalties, with Arsenal eventually winning with Patrick Vieira's last touch for the club.

Much has changed in the ensuing decade, a new stadium, a new manager, hundreds of millions of pounds' worth of players - but have the sides improved?

We asked Mikael Silvestre - who played for both clubs - to pick combined sides made up of today's squads, and those who played in the 2005 final.

Gary Lineker
BBC Sport

Big games need big panels. For MUFC v AFC, Alan Shearer, Roy Keane & @IanWright0, external Three men who could give it, take it and deliver. @BBCOne, external 7.30

The Manchester United team bus has just arrived at Old Trafford. Will we see some changes to the side tonight? Michael Carrick and Phil Jones have walked in with their team-mates. We won't know the team for around half an hour.

Working out the time of the last train home can often give supporters headaches when travelling to midweek fixtures - including for Arsenal fans this evening.

With the last scheduled train from Manchester Piccadilly to London Euston this evening being 21:15 GMT (some 20 minutes into the second half), Arsenal have chartered two special trains, external to get fans back to London tonight.

Prices were also considerably cheaper than if you were just travelling for work or pleasure - £30 for a first class return and £20 for a standard return.

Can't imagine the carriage scenes looked much like when these Fulham fans caught a special service to Ipswich in 1957.

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Arsenal boss Arsene Wenger has admitted sacrificing his side's FA Cup chances in previous seasons to boost their prospects of European glory.

Arsenal's Champions League hopes this year may be all but over after a disastrous 3-1 defeat at home to Monaco last month, but historically the FA Cup has had to play second fiddle for Wenger.

"The FA Cup was badly positioned before the Champions League - you always had decisions to make," said Wenger.

"A player who was a bit on the edge - what do you sacrifice? It was always the FA Cup in the end.

"Sometimes as well I did not sacrifice the FA Cup years before and we paid the price because we lost one or two important players two or three days before an important game."

In the draw rehearsal which has just taken place, Manchester United or Arsenal were drawn against Bradford or Reading, by the way.

The picture will become clearer in a few hours' time.

The draw for the semi-finals of the FA Cup will take place after tonight's game with Aston Villa the only side assured of a place in the last four after their 2-0 win over West Bromwich Albion.

Liverpool's 0-0 draw with Blackburn means they both join Bradford and Reading, who also drew 0-0, in the hat.

The draw 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.

Reading and Bradford will replay their last-eight tie at the Madejski Stadium on Monday, 16 March with the date for the Blackburn-Liverpool game still to be confirmed.

I hope I do speak for everyone when I call for a Cup classic tonight.

Give me goals, excitement, mistakes, drama, a red card or two - just action and antics by the bucketload.

Dear Messrs Van Gaal and Wenger,

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It has been a testing weekend for us all. Three FA Cup quarter-finals have come and gone with a paltry two goals shared between them.

Image source, PA

We had as many pitch invasions as goals - with all of the meaningful action coming at Villa Park. Of the eight quarter-finalists, only West Brom have been eliminated.

The creaking calendar is struggling to accommodate any more replays, BBC One have had to move EastEnders in the middle of a big storyline, and 10,000 Arsenal fans have come to Manchester for tonight's match.

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We really, really want a great game. We need goals, incidents, late drama, intrigue, suspense - we need the magic back. Do you remember 1999 by any chance? Something like that would be just great.

If you could please oblige, we'd be ever so grateful.

Yours sincerely,

The footballing public...