Full-time: Chelsea 1-1 Lyon (2-3 agg)
Lyon struck early to go 3-1 up on aggregate
Chelsea hit back through Ji's free-kick; 2-3 agg
4,670 in attendance at Kingsmeadow
Londoners were bidding to reach their first final
Lyon have won the title five times since 2011
Final to be held in Budapest on 18 May
Chelsea 1-1 Lyon (2-3 agg)
Chelsea are causing Lyon all sorts of problems down the left with Karen Carney and Fran Kirby linking up frequently and to good effect.
The Blues threaten again as Ji So-yun heads a deep short corner back across goal into the danger area but there's no Chelsea teammate on hand to take advantage.
Wendie Renard becomes the latest Lyon player to be booked for a lunging tackle on Ji in the Chelsea half.
Chelsea 1-1 Lyon (2-3 agg)
More than 4,600 fans are in attendance today, it has just been announced over the tannoy.
And they are getting value for money, and then some.
Lyon are beginning to threaten again, with Amel Majri firing over and Delphine Cascarino drilling straight at Chelsea keeper Ann-Katrin Berger from a tough angle.
That is Cascarino's final contribution as she is replaced by Shanice van de Sanden.
Chelsea 1-1 Lyon (2-3 agg)
It's starting to feel like it might not be Chelsea's day.
A superb Erin Cuthbert free-kick causes panic in the Lyon box and the ball falls to Millie Bright in the six-yard box but her point-blank strike is somehow blocked by keeper Sarah Bouhaddi.
Chelsea 1-1 Lyon (2-3 agg)
On comes Beth England for Ramona Bachmann. The Switzerland international was on a booking so no surprise she is the one to make way.
Lyon are losing the plot a bit here. Loose passes and silly tackles. Jess Fishlock is booked for bringing down the dangerous Fran Kirby.
Chelsea 1-1 Lyon (2-3 agg)
Image source, Getty ImagesLyon clinched their 13th straight French league title on Wednesday.
The French side are now aiming for a fourth consecutive European crown, and their sixth since 2011.
But, right now, they are rattled.
Chelsea 1-1 Lyon (2-3 agg)
Jayne Ludlow
Wales manager on BBC Sport
We have a game on now! Chelsea are really in the ascendancy.
Chelsea 1-1 Lyon (2-3 agg)
Oh my goodness. Karen Carney hits the post with a superb curler from what seemed an impossible angle.
Chelsea are so, so unlucky not to be ahead here.
Chelsea 1-1 Lyon (2-3 agg)
This is as intriguingly poised as....something that is poised very intriguingly indeed.
It's not quite next goal wins it, but it's not far off.
Chelsea 1-1 Lyon (2-3 agg)
Lyon have been all-conquering in recent seasons - in France and in Europe. But it has to be said that Chelsea have more than matched them over a leg and a half here.
They have just created a huge chance to go ahead as Fran Kirby's superb run and cross set up Ramona Bachmann around 10 yards out but her goalbound shot is blocked by Amel Majri.
Superb positional defending from the Lyon full-back.
Chelsea 1-1 Lyon (2-3 agg)
Chelsea are on the back foot at the start of this second half.
Lyon know a second away goal will kill this tie. Chelsea defenders Maren Mjelde and Millie Bright have just made a pair of crucial last-ditch blocks to keep the second-leg score at 1-1.
Chelsea 1-1 Lyon (2-3 agg)
Lyon general manager Gerard Houllier is among those sampling the cracking atmosphere at Kingsmeadow today.
The former Liverpool boss knows all about European success, having led the Reds to the UEFA Cup in 2001.
Image source, Rex FeaturesChelsea 1-1 Lyon (2-3 agg)
Visitors Lyon have made a half-time change, Wales international Jess Fishlock replacing Selma Bacha.
Chelsea's Magdalena Eriksson is fortunate to get away without conceding a free-kick for a pretty high challenge on Delphine Cascarino.
Chelsea 1-1 Lyon (2-3 agg)
Chelsea get the second half under way.
Will this 45 minutes provide the answer of who will meet Barcelona in the Women's Champions League final on 18 May?
Or will extra time be needed to separate these sides? A 2-1 Chelsea win is the only scoreline that can necessitate an additional 30 minutes at Kingsmeadow this afternoon.
Result: Brighton 0-4 Arsenal
Image source, Getty ImagesEarlier, Arsenal Women became champions of England for a 15th time as they beat Brighton at the Amex Stadium in front of a new WSL-record crowd.
HT: Chelsea 1-1 Lyon (2-3 agg)
In case you missed it, players from Chelsea, Man City and new champions Arsenal dominated the PFA Women's Team of the Year, which was revealed this week.
HT: Chelsea 1-1 Lyon (2-3 agg)
Emma Hayes invited a Holocaust survivor to speak to her players this week to remind them to value life, telling BBC Sport:
"It was a reminder that we’re going to need resilience. But we can be good people and we can be humble in that process.
"I’m so proud of the club's work, rooting out discrimination in all forms. I thought it was important that the players received some education around the values of life and what people have gone through to be here.
"What we do, we’re extremely privileged. I felt the players benefited immensely from her story. We all recognised how lucky we are."
HT: Chelsea 1-1 Lyon (2-3 agg)
Jayne Ludlow
Wales manager on BBC Sport
We saw a good Lyon start and Cascarino having a great game again, but now we're seeing Chelsea coming in to the game far more.
Chelsea 1-1 Lyon (2-3 agg)
What a half that was. You might have expected a cagey game with Lyon perhaps tempted to just protect their first-leg advantage. But that has not been the case.
The visiting supporters were celebrating when Maren Mjelde's own goal extended their aggregate lead to 3-1 but Chelsea have given as good as they have got and Ji So-yun's cracking free-kick has them deservedly level on the day.
Image source, Getty ImagesChelsea 1-1 Lyon (2-3 agg)
Three minutes of time added on.
Half a chance for Lyon as a cross from the left reaches Ada Hegerberg but, under pressure, her first-time strike dribbles wide.
Chelsea 1-1 Lyon (2-3 agg)
Jayne Ludlow
Wales manager on BBC Sport
What Chelsea can't afford to do is allow Lucy Bronze to run in to space in central areas.