Ian Wright has just taken his seat between Alan Shearer and Phli Neville. Very country gent tonight.

The boys are on air in 15...

Bristol City: Fielding, Wright, Kalas, Baker, Dasilva, Pack, Eliasson, Morrell, Palmer, O'Dowda, Diedhiou. Subs: Pisano, Brownhill, Weimann, Kelly, Paterson, O'Leary, Eisa.

Bolton: Matthews, Hobbs, Beevers, Wilson, Little, Pritchard, Murphy, Lowe, Connell, Magennis, Noone. Subs: Taylor, Donaldson, Ameobi, Buckley, Olkowski, O'Neil, Ben Williams.

Referee: Stuart Attwell (Warwickshire)

Leston Rayner: At the start of the year, who would have thought that a Team containing Alexis and Lukaku would be called a 2nd string side

Nigella: it's ridiculous how strong @ManUtd, external squad is. Rashford, DDG and Martial missing and still their 1st XI features Lingard, Lukaku and Sanchez. That is power..

BBC Radio 5 live

There's no commentary of tonight's games on 5 live tonight but there is plenty of analysis and chat - join Matthew and the gang now by pressing play above.

Including this man...

Matthew Etherington
Former West Ham winger on BBC Radio 5 live

It will be tough for Arsenal, Manchester United are in great form and looking for their eighth win. It is going to be a great game, it always is between these two teams.

It is a big statement from the manager to not start Mesut Ozil. Their relationship seems like its struggling. I was at the Brighton game and his performance was poor, his application was nowhere near good enough so I understand where Unai Emery is coming from.

Mark Lawrenson
Ex-Liverpool defender

We know Arsenal are not great defensively, and Hector Bellerin's injury is a big blow to them, but their home record is very, very good.

United have been very impressive individually and collectively under Ole Gunnar Solskjaer, but his winning run has got to end sometime.

Image source, EPA

I wish people would stop talking about whether Solskjaer should get the job permanently - just let him keep going, and see what happens.

Winning the FA Cup is a realistic aim for both teams, but the consolation for whoever loses this tie is that both teams are right back in the race for fourth place.

Lawro's prediction: 2-1

Manchester United

Manchester United manager Ole Gunnar Solskjaer to BBC Sport: "These are the two most successful teams in the FA Cup. I’ve had some great games against Arsenal, both wins and defeats. To be on the outside will be different.

"Rom [Lukaku] gives us a physical presence up front, we might get more crosses into him. Alexis [Sanchez] is champing at the bit. We need to get him going again, he’s been out for a few weeks.

"The FA Cup final is a fantastic game to play in. But to get to the final you need to overcome difficult hurdles. We think this team will match and hopefully beat Arsenal."

Phil McNulty
BBC Sport chief football writer at Emirates Stadium

Manchester United's men in form Marcus Rashford and Anthony Martial may be on the bench - but there is no lack of punch in a side featuring Romelu Lukaku, Jesse Lingard and Alexis Sanchez.

Suspect Sanchez may not be feeling the love from the Arsenal fans who once adored him as he returns to Emirates Stadium.

There are four changes for Play-Off chasing Bristol City and six changes for relegation threatened Bolton from their previous Championship fixtures.

Image source, Getty Images

Manchester United caretaker manager Ole Gunnar Solskjaer: "That's the one fierce football rivalry of my years here as a player.

"We were always the closest rivals. They won the double, we won the treble. The games were just fantastic.

"We had a great team, and they had a very good team. There were some tackles flying in between the two teams. They were fantastic games."

West Ham United

Marko Arnautovic has taken to social media to confirm that he is going to stay at West Ham.

Read more as it develops here.

With nine goals and nine assists, Alexis Sanchez has been directly involved in 18 goals in 19 FA Cup appearances during his time at Arsenal and Manchester United.

Mesut Ozil is on Arsenal's bench today. They make three changes from the 2-0 win over Chelsea on Saturday - with Ainsley Maitland-Niles at right-back, goalkeeper Petr Cech and forward Alex Iwobi all in.

Arsenal: Cech, Maitland-Niles, Papastathopoulos, Koscielney, Kolasinac, Torreira, Xhaka, Iwobi, Ramsey, Aubameyang, Lacazette.

Manchester United forward Alexis Sanchez starts against his old club in one of five changes from the 2-1 Premier League win over Brighton.

Luke Shaw is back from illness to replace Diogo Dalot at left-back. Marcus Rashford and Anthony Martial drop to the bench.

Man Utd: Romero, Young, Lindelof, Bailly, Shaw, Herrera, Matic, Pogba, Lingard, Sanchez, Lukaku.

RegularJon: Very disappointed United aren’t at full strength. Hoping that we still get at least a draw without DDG, Rashford and Martial in the XI

Arsenal

There are just three changes from Arsenal, and one of those is enforced.

Ainsley Maitland-Niles replaces the crocked Hector Bellerin, Petr Cech starts in goal and Alex Iwobi is in for Matteo Guendouzi.

Ole Gunnar Solskjaer tells Gabby Logan what he believes are the three main attributes to being a top-class striker, as the interim Manchester United manager prepares to face Arsenal in the FA Cup fourth round.

Watch the full Solskjaer interview on BBC iPlayer.

Manchester United

Romelu Lukaku and Alexis Sanchez start for Manchester United, who make five changes in total.

Also in are Sergio Romero, Eric Bailly and Luke Shaw.

Full team news to come.

Martin Keown
Former England and Arsenal defender

Arsenal are a different animal at home, they have beaten Spurs and Chelsea here recently.

If they can play like street fighters again they can win it. I hope there are not too many changes.

Sit back, hide behind the sofa and enjoy the spectacle.