If Chelsea score at Wembley, expect huge roars in Burnley.

Why?

If Southampton don't win the FA Cup then the team finishing seventh in the Premier League will play in Europe next season.

Burnley are the team currently occupying seventh spot - eight points ahead of eighth-placed Leicester.

Read how seventh place gets into Europe here.

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Lovely scenes at Wembley.

Southampton fans get off their seats and join Chelsea fans clapping as a picture of former Chelsea and England midfielder Ray Wilkins appears on the big screen at Wembley.

Ray died aged 61 earlier this month.

This is what they are playing for...and doesn't it look lovely in the Wembley sunshine.

But which team's trophy cabinet will it be sitting in one month's time?

Image source, Reuters

Steve Wilson
Match of the Day commentator at Wembley

Chelsea's quick-fire comeback at St Mary's last weekend will have left Antonio Conte confident his Chelsea side can reach a second FA Cup final in succession.

Conte will also have been delighted with how his side embraced a tactical tweak to win at Turf Moor on Thursday - ending Burnley's five-match winning streak.

It's a funny old game...

6 January: Stoke City fans display a Hughes out banner during their team's FA Cup third round defeat at League Two Coventry.

22 April: Hughes leads Southampton out against Chelsea in the FA Cup semi-final at Wembley.

Image source, Rex Features

Half an hour before kick-off.

Both sets of players are out on the pitch, the Wembley seats are filling up and One Step Beyond is booming out of the speakers around the national stadium.

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Stephen Warnock
Ex-Liverpool defender on BBC MOTD Extra

Winning the FA Cup wouldn't be a successful season for Chelsea. They have not qualified for the Champions League so it is not. They have a different mindset, but it might be a fitting end to Antonio Conte's reign, he would have won an FA Cup and Premier League title in two years.

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Southampton

Southampton boss Mark Hughes makes two changes to his team from the side which played out a goalless draw at Leicester on Thursday.

Mario Lemina is passed fit after he missed the game against the Foxes with a virus and takes the place of James Ward-Prowse in midfield.

Hughes also makes an attacking tweak with Charlie Austin preferred to Dusan Tadic.

Southampton XI: McCarthy, Cedric, Hoedt, Yoshida, Bednarek, Bertrand, Romeu, Højbjerg, Lemina, Austin, Long.

Chelsea

Chelsea manager Antonio Conte makes four changes from the side which beat Burnley 2-1 at Turf Moor last Thursday.

Goalkeeper Willy Caballero replaces Thibaut Courtois between the sticks, with the Belgium international not in the matchday squad.

Attacking duo Willian, Eden Hazard and Cesc Fabregas return to the starting line-up with Alvaro Morata, Tiemoue Bakayoko and Pedro both dropping to the bench.

Chelsea XI: Caballero, Azpilicueta, Cahill, Rudiger, Moses, Kante, Fabregas, Emerson, Willian, Giroud, Hazard.

Image source, Rex Features

Steve Wilson
Match of the Day commentator at Wembley

Relegation is still looming very large over Southampton despite their first league point under Mark Hughes at Leicester on Thursday.

Saints' fans, who experienced the pain of defeat at Wembley in the League Cup final last season, might be bracing themselves for more heartache in the days and weeks ahead.

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FA Cup final victory or Premier League survival?

Hmmm...

Southampton could find themselves in Wigan's 2013 shoes when Roberto Martinez's Latics experienced the sweet taste of winning the cup and the pain of relegation.

Ironically the Saints could face Wigan, who have won promotion from League One, in the Championship next season.

The Saints are four points from safety with just four games to play.

Darren Bent
Former Tottenham and England striker on BBC MOTD 2 Extra

I feel Alvaro Morata’s pain. People have a go, but as a striker you need to play games, you need consistency and need the backing from your manager. If you put him in for two games, then out for two games he doesn’t get that rhythm to go and score goals.

You look at Romelu Lukaku, He had a dry spell earlier in the season but Jose Mourinho stuck with him and he came through it. Morata has never had that run.

Southampton

Charlie Austin starts for Southampton - one of two changes from the side that drew at Leicester on Thursday.

Midfielder Mario Lemina is also back.

Chelsea

Four changes for Chelsea from the side that won at Burnley on Thursday.

Eden Hazard, Cesc Fabregas and Willian all return along with cup goalkeeper Willy Caballero.

Missed Manchester United's semi-final triumph over Tottenham?

Don't worry!

You can watch the highlights by clicking above.

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Our old friend video assistant referee is back for the semi-final. Confusion may reign at some stage.

Here is five things to do while waiting for a VAR decision...

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Saints fans have brought the weather with them to Wembley.

It's definitely a factor 20 sunscreen day!

Short sleeves, ice cream...the temperature is more suited for cricket and beach volleyball.

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Will Willian and Eden Hazard be back in Chelsea's side?

Will Mark Hughes make changes to his Southampton team?

Team news coming up in around 15 minutes.

Image source, Rex Features