We shall discover the tactical machinations very shortly.

The players are out on the pitch, to a fantastic reception. It's a great atmosphere in Barcelona.

Image source, Reuters

While Chelsea's quadruple hopes have faded, Barcelona are still on track to win four trophies.

Having already won the Spanish Super Cup, Barca have booked their Copa de la Reina final place and have a 12-point lead in Liga F.

Having had their own quadruple spoiled, could Chelsea play the spoiler today?

There are expected to be around 37,000 supporters at the Estadi Olimpic Lluis Companys today.

Built for the 1992 Olympics in Barcelona, the stadium has been used by the Barca men's team throughout this season as Camp Nou is being redeveloped.

The last Champions League game to take place here was the men's quarter-final second leg this week - where PSG won 4-1 to dump the hosts out.

How Chelsea would love a similar outcome today.

Emma Sanders
BBC Sport

Ballon d'Or winner Aitana Bonmati says things "have not changed" for female players in Spain despite winning the 2023 Women's World Cup.

Striker Jenni Hermoso filed a legal complaint against ex-Spanish football federation president Luis Rubiales following their victory over England.

As well as issues with the national team, Bonmati says the domestic league still has "a lot of problems".

"There is not anything that has changed," she told BBC Sport.

"I would like to say that everything has changed and the World Cup gave us more things - but I cannot say that. I compare [it to] when England won the Euros - everything changed.

"But we won the World Cup which I think is bigger than winning the Euros and no, it never changed, especially in the league. We are having the same problems as always. We have a lot of problems."

Speaking in an exclusive interview before Barcelona's Women's Champions League semi-final against Chelsea on Saturday, the midfielder discussed the differences between Spain's Liga F and England's Women's Super League (WSL). You can read the full interview here, plus watch a clip below.

ESPN women's football writer Sophie Lawson, speaking to BBC 5 Live Breakfast: “It’s very exciting. If Chelsea’s form coming in was slightly better if they had a few less injuries, I think this would be worthy of a final rather than a semi-final. But there’s plenty of excitement there.

“I think Barcelona’s form coming is just that little bit better. Chelsea have had a couple of unexpected losses. They’re still struggling without Sam Kerr. If Chelsea can keep things respectable after today, then back at Stamford Bridge next week and then it’s anyone’s game.”

It has not gone to plan so far in Emma Hayes' final season with Chelsea, having already been knocked out of the Women's FA Cup after losing the Continental Cup final to Arsenal earlier this year.

However, they remain level on points with Manchester City at the top of the Women's Super League table and midfielder Erin Cuthbert says Hayes' legacy "will not be defined on a Champions League" trophy.

"Nothing extra enforces my commitment to winning any title. If you're a Chelsea player, the commitment is to win every single title that you're involved in," added Cuthbert.

"[Emma] has been an incredible servant to the women's game. She's single-handedly driven it up so much across the world. We don't owe it to Emma.

"We all want to win and if you don't want to win, you shouldn't be at a club like Chelsea."

Image source, Getty Images

Emma Hayes is not the only manager in Barcelona today who is departing at the end of the season.

Barca boss Jonathan Giraldez is departing to take over American NWSL side Washington Spirit, and his players hope to see him go out on a high.

"I am sure the girls will want to win trophies for him so he can leave on a really positive note," Barcelona midfielder Keira Walsh told reporters on Wednesday.

"He has had a massive impact here at Barca, everyone really likes playing for him and hopefully we can get the job done.

"It's the Champions League so everyone comes in to it with a different mindset."

Image source, Getty Images

Away from the Champions League, we have some Chelsea transfer news to bring you if you missed it last night.

Goalkeeper Ann-Katrin Berger, 33, has joined American side NJ/NY Gotham FC for an undisclosed fee.

Berger kept 60 clean sheets in 114 appearances during her five-year stay with Chelsea, as she won four Women's Super League titles, three FA Cups and two League Cups with the Blues.

However, she made just five WSL appearances for Chelsea this season, with boss Emma Hayes recently preferring Hannah Hampton and Zecira Musovic in goal.

Her final appearance for the club came in the League Cup final defeat to Arsenal last month.

Hayes said the goalkeeper has "legendary status" at the club.

"An amazing servant," she added. "I always say I've never seen a goalkeeper save penalties like Ann, the best in the world."

Image source, Getty Images

Emma Sanders
BBC Sport at Estadi Olímpic Lluís Companys

Image source, BBC Sport

This is such a unique stadium.

The old Olympic monuments are all around the edge of the stadium and horse statues mark the main entrance.

When we arrived last night, we weren't sure if it was the football stadium because (as someone else described it) there's a giant "spaceship" dome to the right which is another sports arena.

When you eventually get inside, it's a perfectly-kept football pitch, which is ideal for the way this Barcelona team wants to play.

Chelsea were booed when they ran out for warm-ups but an hour earlier, with fans still soaking up the atmosphere outside, they had been posing on the pitch taking photos in the sun.

Image source, BBC Sport

Image source, Paul Roberts

Now that's what I call an away day.

Anita Asante
Former England defender on BBC Radio 5 Live

I think it's a daunting prospect for any team in Europe that would face a Barcelona side that we have seen in recent times have got such quality, strength in depth. They are a difficult team to meet.

We saw how they undid Chelsea in 2021 in that final. But now Chelsea have that experience of playing Barcelona and sometimes going into those big games, going up against an unknown entity because you’ve never faced them before there is that extra feeling of pressure.

But now they have that in the locker and they can go into this with a bit more confidence but still expecting that it will be a really difficult game.

Helen Ward
Former Chelsea striker on BBC Radio 5 Live

I don’t think those Chelsea players that were involved in that defeat in the final [against Barcelona in 2021] will want a repeat of that.

They will be much better prepared and because it’s two legs they can almost bide their time in the first leg and make sure they are still in the game at the halfway point when they come back to Stamford Bridge.

I do see it being a closer game, I think I see a Barcelona victory, but I think it will be a narrow one and it will keep Chelsea in the tie when they bring them back home.

Emma Sanders
BBC Sport at Estadi Olímpic Lluís Companys

Image source, BBC Sport

Barcelona is a bustling city with beautiful architecture and views. You get to enjoy all of it as you walk up from the centre towards the stadium.

The Estadi Olimpic Lluis Companys sits on the top of a hill and when we left last night's media conference, the sun was setting over the city.

We walked along the grounds of the famous Olympic diving pool and saw plenty of Barcelona fans.

This morning even more Barcelona shirts were on display and though the locals tell me they prefer playing at Camp Nou, they are starting to feel more at home here.

Image source, BBC Sport

While the Chelsea players arrived in club tracksuits earlier, the Barcelona players - and manager - rocked up in their civvies.

Some seriously fashionable get-ups on show. I'm a particular fan of Aitana Bonmati's retro Barca top.

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

Pat Nevin
Former Chelsea and Scotland winger on BBC Radio 5 Live

It's tough at the minute for Chelsea.

They were going for all four trophies a little while back, and losing the [Continental] cup final was a tough one.

They're now in great difficulty in the league as well, absolute neck and neck there. Probably second favourites now to Man City. So you're almost looking at this, the Champions League against Barcelona, the best club team in the world, as their best chance of silverware.

They are capable of doing it. But in simple terms, they must still be in this tie at the end of this 90 minutes. That is what its all about.

Along with Erin Cuthbert, Niamh Charles has stepped up in Bright's absence to share captaincy duties at Chelsea.

The 24-year-old England international has played all but one of the Champions League games this season and has put in solid displays, with six tackles, seven clearances and an average 83.43% passing accuracy.

Charles' unwavering resolve and awareness pose a formidable challenge to Barcelona's relentless attack, but she will have her hands full against a player of Caroline Graham Hansen's quality.

The Norway winger's season so far has been nothing short of spectacular, contributing 26 goals and 25 assists in 29 electrifying matches.

Graham Hansen is currently joint-top of Liga F's scoring charts with 17 goals, alongside Paralluelo, and has also provided 16 assists. Despite missing the last two weeks with a muscle injury, Giraldez has confirmed the 29-year-old will be available to face Chelsea in what promises to be an epic contest.

Image source, Getty Images

In a game where converting chances is the most important thing, we can't forget about the two experts in the penalty areas: Salma Paralluelo and Mayra Ramirez.

Paralluelo is the joint-highest scorer in the Spanish league with 17 goals, level with team-mate Caroline Graham Hansen. Only Lyon's Kadidiatou Diani has scored more than her in the Champions League this season.

At the other end of the field will be Ramirez, the exciting signing that Chelsea secured this January. The London club paid 450,000 euros (£384,000), plus up to 50,000 euros (£42,600) in add-ons to Levante.

While the Colombia forward scored her first and only Champions League goal in the quarter-final victory over Ajax, Saturday presents an opportunity for the 25-year-old to shine on Europe's biggest stage.

Image source, Getty Images

While Chelsea have been without key players such as Millie Bright and Sam Kerr for much of this season, Barcelona have also missed important personnel.

In the absence of defenders Irene Paredes, Fridolina Rolfo and Mapi Leon, Ingrid Syrstad Engen's versatility has been a standout for Giraldez's side.

Since the Norway international's seamless transition from midfielder to centre-back in November Barcelona are unbeaten, conceding just six goals across the Champions League and Liga F

However, Engen has yet to face the toughest European teams in her new role and Saturday's match-up against Lauren James will present a significant examination of her capabilities.

While James has only scored one Champions League goal in six appearances this season, her attacking prowess cannot be underestimated. She is second in the WSL scoring charts with 13 goals and was named in the Fifpro Women's World XI.

The England international did not feature in Chelsea's win over Aston Villa on Wednesday and Hayes said the 22-year-old will have her fitness assessed again on Friday.

Image source, Getty Images