Image source, Arsenal/Twitter

Not in the squad but at Wembley to support his team-mates.

Alexis Sanchez looking very sharp as he peruses the match programme.

Fabian Pavez: Man United has shaped up absolutely well, the signing of Matic was the masterstroke.

Image source, Getty Images

There's a chance we'll see ABBA today. No, not the Swedish pop group but rather the penalty shootout format that will be trialled if the game ends in a draw after 90 minutes.

The system, based on the format used in tennis tie-breaks, sees the team going first in the shootout taking one spot-kick before their opponents take two in succession.

Each team then takes two in a row until we have a winner - AB BA AB BA, hence ABBA.

Tom Rostance
BBC Sport at Wembley

The team announcements were greeted in apathetic fashion inside a still largely empty Wembley. After a summer of record signings galore, £200m strikers and £50m right-backs it's all a bit underwhelming to have one debutant on display out of 22.

Image source, Getty Images

It is certainly a nice day for a bit of football in London. A decent 21C with some sunshine poking through the clouds.

Chelsea boss Antonio Conte: "It was a pity to lose the FA Cup final against Arsenal after a really great season for us.

"Now there is another game. We know very well Arsenal are a strong team. We are expecting a difficult game and we want to start the season with a win.

"I think the friendlies have ended for us. This is an official game and the first trophy of the season. It's an important game, for sure."

Image source, Getty Images

There has been A LOT of money spent by Premier League clubs this summer with Manchester United joining Arsenal and Chelsea in spending big to improve their attacking options.

United signed Romelu Lukaku from Everton for £75m and the big Belgian forward has something neither Alexandre Lacazette and Alvaro Morata have - Premier League experience. He banged in 25 league goals last season. Have a gander at some of the best below.

Despite that, when we asked which club got the best deal out of Arsenal, Chelsea and Manchester United, 40% of BBC Sport readers voted for the Gunners. We should get a glimpse of whether they are right today.

Chris Sutton
Ex-Chelsea striker at Wembley for 5 live Sport

This is a huge season for Alvaro Morata. Is he a like-for-like replacement for Costa? I think this afternoon we will see him in a number 10 role at some point.

Tom Rostance
BBC Sport at Wembley

Image source, PA

It's all about who isn't playing, rather than who is, at Wembley.

Arsenal leave Mesut Ozil and Alexis Sanchez out of their squad altogether, although there is a debut for record signing Alexandre Lacazette. There are four changes from the FA Cup final winning XI with Petr Cech, Mohamed Elneny and Alex Iwobi joining the new number nine in the team.

Chelsea make three changes from the team which lost the FA Cup final - and there are no new faces at all in their starting XI. Cesc Fabregas, Michy Batshuayi and Willian come in for the departed Nemanja Matic, the exiled Diego Costa and the injured Eden Hazard.

Record signing Alvaro Morata is only on the bench, alongside fellow new boy Antonio Rudiger.

And Alexandre Lacazette starts for Arsenal, but there's no Alexis Sanchez in the squad. Mesut Ozil is also not included.

Chelsea's record signing Alvaro Morata has to make do with a place on the bench as Michy Batshuayi starts in attack.

Arsenal XI: Cech; Holding, Mertesacker, Monreal; Bellerin, Elneny, Xhaka, Oxlade-Chamberlain; Welbeck, Iwobi; Lacazette.

Chelsea XI: Courtois; Azpilicueta, David Luiz, Cahill; Moses, Fabregas, Kante, Alonso; Willian, Batshuayi, Pedro.

Image source, Getty Images

Arsene Wenger has also been splashing the cash with Alexandre Lacazette joining for a club-record £46.5m from Lyon.

Lacazette, who has won 11 caps for France, was the second-highest scorer in Ligue 1 last season with 28 goals. He netted 129 goals in 275 matches in all competitions for Lyon after breaking into the first team in the 2009-10 campaign.

Bosnian left-back Sead Kolasinac also arrived at Arsenal in the summer, moving on a free transfer from Schalke. The 23-year-old is tall, stocky and versatile - he can also play in the centre of defence and left midfield - and has been impressive in pre-season.

Both could feature today but we will find out soon enough. Team news is imminent.

Image source, Getty Images

Image source, Getty Images

So what has changed at both clubs since the FA Cup final? Quite a lot actually.

Starting with Chelsea, long-serving defender John Terry has left while Diego Costa, who got the Blues' goal at Wembley, has been told by Antonio Conte he can leave the club and won't be selected today.

Conte has spent big on Costa's replacement with Spain forward Alvaro Morata joining from Real Madrid in a club-record £60m deal. Chelsea have also signed goalkeeper Willy Caballero, defender Antonio Rudiger and midfielder Tiemoue Bakayoko this summer.

So pre-season is pretty much over with the start of the Premier League season just a few days away.

What have you learned about how your team is shaping up from the summer? Are they in for a better or worse season than the last one?

Let us know via #bbcfootball, text in on 81111 (UK only) or post a comment on the BBC Sport Facebook page.

As well as the Community Shield there's plenty of decent football coming up today.

Our build up to today's Scottish Premiership action has just got under way as Motherwell host Rangers at 13:30 BST. You can follow that here.

The Netherlands face Denmark in the final of the Women's European Championships at 16:00 and we'll have live text and BBC Radio 5 live coverage of that game.

Finally, Bolton take on Leeds at 16:30 in the Championship and there will be live text coverage of that game from 16:00.

As well as listening to the game on BBC Radio 5 live you can also watch in-play clips for goals and key action from the game on this very page.

We'll also have highlights of the game online later today and on BBC One at 22:30 BST.

BBC Radio 5 live

There is build-up to the Community Shield live from Wembley on BBC Radio 5 live right now with commentary on the game from 14:00.

As ever, you can listen on the radio or online.

Image source, Getty Images

It's not that long since these two last squared up - 71 days ago in fact, if I have got my maths right.

Arsenal beat Chelsea 2-1 in the FA Cup final on 27 May, Alexis Sanchez scoring the opener. The Chilean's future at the Emirates was in doubt then... and that still remains the case today. However, he is still an Arsenal player for now and available for selection today.

Whether he plays or not is unclear as he recovers from illness. We'll find out for definite when the team news is announced at around 13:00 BST.

Tom Rostance
BBC Sport at Wembley

Wembley is looking as glorious as ever as it prepares to welcome football back from the summer break.

The Community Shield is often seen as either just a friendly by fans (if their team loses) or a trophy worth having (if their team wins), but in the press box BBC Sport commentator Guy Mowbray is expecting a good game.

"I've never seen it as a friendly, it's a proper match," he says.

"My first trip to Wembley was for the 1981 Charity Shield and it's a proper test. These two sides served up a disappointing match in 2015 but I'm hoping for better today."

So are we...

Image source, Getty Images

Well, let's be honest, football has never been away really has it?

There's the Women's European Championships reaching its climax today while the EFL and Scottish football seasons kicked off earlier this weekend. Before that there were the various pre-season tournaments that have been taking place across the world.

But today is the unofficial-but-kind-of-official curtain-raiser for the 2017-18 Premier League campaign. It's last season's FA Cup winners versus the reigning Premier League champions.

It's Arsenal versus Chelsea in the Community Shield at Wembley.

Image source, Getty Images

"It was a game of two halves."

"A real six pointer."

"You can't win the title in August but you can lose it."

It's time to dust off the cliches and prepare to read/hear them countless times over the next nine months because...

... football is back!