Image source, BBC Sport

Win or lose, it has been a very good campaign for Watford, who have managed to finish the season with the same manager they started it with, which is a massive success by their recent standards.

Joking aside, they look a more settled side because they have stuck with their coach, and also because of his personality. Javi Gracia is very calm and does not get carried away with any individual results - win, lose or draw.

We know City always have a lot of possession, but people don't always recognise they have got great width, and I am expecting them to really stretch Watford out wide.

Watford won't see much of the ball, and I don't see them creating many chances - so they have to make every set-piece count.

Lawro's prediction: Man City 2-0 Watford

Read more from him here.

When I saw Watford keeper Ben Foster having a good laugh with fans at the hotel restaurant a little earlier on, I'd forgotten that Heurelho Gomes was certain to start today. No wonder he looked so chilled.

Gomes - and Troy Deeney - get the loudest welcomes from the Watford fans just off to my right as the team is announced.

Manchester City forward Raheem Sterling has been one of the best players in the Premier League this season and could be a leading figure in today's final.

The 24-year-old sat down with BBC Sport's Dan Walker for a wide-ranging interview, discussing topics as diverse as racism, the faith shown in him by Guardiola and post-match phone calls from his mother.

Sam Brown: Programme from the last time Watford were in the FA Cup final.

Image source, Sam Brown Twitter

Old Wembley >>>>>> New Wembley

Now the Watford players have joined their City counterparts for their pre-match warm-up. Watford boss Javi Gracia certainly hasn't come to park the bus on his big day out - it's an attacking XI which as a neutral I'm very pleased about.

I always think you need both teams to score to make a good final - Chelsea won 1-0 last season.

Chris Bevan
BBC Sport at Wembley

Image source, BBC Sport

I got the chance to get close to the Wembley pitch earlier, and as a playing surface it looks pretty much perfect. A carpet in fact.

Whoever loses today, they won't be able to blame it on the grass.

John Barnes rapping at Wembley, what more can you ask for?

Make sure you check out BBC Sport's Instagram story for more build-up live from Wembley.

If Deulofeu has a blinder this afternoon he may get a move back to Barcelona, and then be loaned to Everton again...

Roberto Martinez
Belgium manager on Football Focus

Gerard Deulofeu is an exceptional talent, especially one v one. I love everything about him. He is capable of performing at his very best in the big games, he needs these games. Sometimes you are concerned whether your players will adapt to the occasion. Gerard is the opposite, the bigger the occasion the bigger the performance.

Image source, Reuters

Speaking of Ederson, the Brazilian keeper is maiking his 100th appearance in nets for City this afternoon.

He has kept 47 clean sheets in his first 99, conceding just 74 goals.

Pep looked like he had already won the FA Cup during training. Check out these celebrations! Reckon he chipped Ederson from 20 yards out?

Image source, Getty Images

Image source, Getty Images

Here come the City players, bang on cue. Pep Guardiola leaving Sergio Aguero on the bench is the game's first real talking point and doesn't seem to make a lot of sense from up here. Resting him for...?

Ian Wright
Former Arsenal striker on BBC One

For Watford it's a massive, massive opportunity. It is for both teams but more so for Watford because you can see City getting back here again.

Chris Bevan
BBC Sport at Wembley

Image source, BBC Sport

Hawk-Eye's goal-line technology definitely played its part in Manchester City's Premier League title triumph - think John Stones' goal-line clearance against Liverpool and Sergio Aguero's goal against Burnley - so will it help decide the outcome of the FA Cup final too?

If today's game does come down to fine margins, then a lot of work has gone on behind the scenes to get it right.

Hawk-Eye's technicians set up their cameras (six for each goal) at Wembley on Friday, and they were testing them for two hours from lunchtime onwards, before showing the set-up to referee Kevin Friend at 15:00 BST to get his final approval that everything is working as it should be.

Image source, BBC Sport

Thanks Emma, and afternoon one and all!

History awaits us over the next few hours. Either Pep's all-conquering Manchester City sweep the board of domestic trophies, or this vibrant Watford side become brand new winners of this famous old competition.

All set?

Right, time to handover to the legend that is Tom Rostance for the game. He's reporting live from Wembley.

Take it away Rosto!

Ian Wright
Former Arsenal striker on BBC One

Not seeing Sergio Aguero's name on the list will give the Watford players a massive lift.

It goes on the small pile of things that could swing the result in Watford's way.

Phil McNulty
BBC Sport chief football writer at Wembley

Big surprise that Sergio Aguero is on the bench - but how does that list of Manchester City substitutes rank among the strongest ever to sit out a major final?

Watford fans gathering around Wembley, however, really fancy their chances in their first final since they lost to Everton in 1984.

Sergio Aguero, who scored his side's late winner as Manchester City came from 2-0 down to beat Swansea City 3-2 in the quarter-finals,starts on the bench as Pep Guardiola makes one change to the side that clinched the Premier League title at Brighton last week.

Brazilian forward Gabriel Jesus returns - his first start since the semi-final win over Brighton.

Kevin de Bruyne is again on the bench and there is no place in the 18 for 18-year-old midfielder Phil Foden.

Manchester City XI: Ederson, Walker, Kompany, Laporte, Zinchenko, Bernardo Silva, Gundogan, D Silva, Mahrez, Jesus, Sterling.

Subs: Danilo, Stones, Aguero, De Bruyne, Sane, Otamendi, Muric.

Image source, .

Watford make two changes to the side that went down 4-1 at home to West Ham last Sunday.

Keeper Heurelho Gomes, 38, starts in place of Ben Foster after playing in each round this season.

Adrian Mariappa also returns to the defence in place of Christian Kabasele, who is on the bench.

Watford XI: Gomes, Femenia, Mariappa, Cathcart, Holebas, Capoue, Doucoure, Hughes, Pereyra, Deulofeu, Deeney.

Subs: Janmaat, Cleverley, Success, Masina, Gray, Foster, Kabasele.

Image source, .