Postpublished at 56 mins
Chelsea 0-0 Lyon (Agg: 1-0)
Delphine Cascarino loops in a cross and Ada Hegerberg is there at the far post but she wasn't quite anticipating the shot and her former team mate Kadeisha Buchanan beats her to the header.
Result: Chelsea beat Lyon 4-3 on penalties at Stamford Bridge
AET: Chelsea 1-2 Lyon (agg 2-2) - Gilles scored opener before Dabritz got second in extra-time to put visitors ahead in tie; Mjelde levelled tie with last-gasp penalty in extra time
Blues will play last year's runners-up Barcelona in semis
Result: Wolfsburg 1-1 Paris St-Germain (agg 2-1) - German side will face Arsenal in last four
Jess Anderson
Chelsea 0-0 Lyon (Agg: 1-0)
Delphine Cascarino loops in a cross and Ada Hegerberg is there at the far post but she wasn't quite anticipating the shot and her former team mate Kadeisha Buchanan beats her to the header.
Chelsea 0-0 Lyon (Agg: 1-0)
Karen Bardsley
Former England and Manchester City goalkeeper on BBC Radio 5 Live
How many warnings shots do Chelsea need?
Do what you did in the first half. Don’t dally on the ball. If it needs to go, go.
They are vulnerable.
Chelsea 0-0 Lyon (Agg: 1-0)
Emma Sanders
BBC Sport at Stamford Bridge
Emma Hayes was a little nervous then! She spun around with her head in her hands before telling her team to push up the pitch and away from their goal. Magdalena Eriksson has looked a bit shaky.
Chelsea 0-0 Lyon (Agg: 1-0)
Oops.
Magdalena Eriksson is just a bit too hesitant on the ball right in front of her own goal and Danielle van de Donk pounces to try and take advantage.
It turns into a bit of a wrestling match but in the end Eriksson does well to just shepherd the ball away from van de Donk and prevent her having a free shot on goal.
Chelsea 0-0 Lyon (Agg: 1-0)
Kelly Smith
Former England striker on BBC Radio 5 Live
Sam Kerr is special.
She has been a threat playing on those centre-halves’ shoulders. As soon as she can, she spins into that space and Chelsea are looking to stretch that backline.
Lyon do not play against players like Sam Kerr in the French league. They don’t get tested.
Chelsea 0-0 Lyon (Agg: 1-0)
Ohhh unlucky.
Eve Perisset does well to pick out Guro Reiten in the box but the Norway international's touch just lets her down and it's out for a goal kick.
Chelsea 0-0 Lyon (Agg: 1-0)
Guro Reiten goes for the shot from range but Christiane Endler collects.
Chelsea 0-0 Lyon (Agg: 1-0)
Fast start to the second half as expected. Damaris Egurrola gives Lauren James a bit of a shove and concedes a free-kick but Chelsea can't do anything with it.
Chelsea 0-0 Lyon (Agg: 1-0)
Away we go for a HUGE 45 minutes in London.
Chelsea 0-0 Lyon (Agg: 1-0)
Emma Sanders
BBC Sport at Stamford Bridge
Big game. Big moments. Big players.
Sam Kerr has already had one. Will she get another? Or will Ada Hegerberg make her mark? This could go either way.
People are on their feet trying to get a glimpse of Hegerberg. She's a superstar in Stamford Bridge.
Chelsea 0-0 Lyon (Agg: 1-0)
Confirmation, here she comes.
The Women's Champions League record goalscorer Ada Hegerberg is coming on for Signe Bruun.
Strap in, folks.
HT: Chelsea 0-0 Lyon (Agg: 1-0)
Emma Sanders
BBC Sport at Stamford Bridge
The sight Chelsea fans didn't want to see.
Ada Hegerberg has been warming up intensely at half-time and she's got a coach out with her doing passing drills now.
Is she about to come on?
HT: Chelsea 0-0 Lyon (Agg: 1-0)
Kelly Smith
Former England striker on BBC Radio 5 Live
Lauren James is key in this.
If you can get her in that final third, in those spaces she can turn, she can dribble and play the ball to Sam Kerr.
Their link up and understanding is very good.
HT: Chelsea 0-0 Lyon (Agg: 1-0)
A reminder that the winner of this tie will face Barcelona in the semi-final in April. Who is going to progress, folks?
Hit the thumbs - thumbs up for Chelsea, down for Lyon.
HT: Chelsea 0-0 Lyon (Agg: 1-0)
Emma Sanders
BBC Sport at Stamford Bridge
Chelsea's men's boss Graham Potter is in the stands at Stamford Bridge and he must be feeling as nervous as everyone else.
This game is really in the balance. It's been so open and both teams have had some big chances.
You feel Emma Hayes will be more satisfied by that first-half performance though. Chelsea's game plan is working.
Lyon are having to take risks in search of a goal and that plays into the hands of Sam Kerr and her brilliant runs in behind. They haven't dealt with them and you feel if Kerr gets another chance, she won't miss.
HT: Chelsea 0-0 Lyon
"It feels like a normal game to me but we're 1-0 behind so we have to score a goal," Lyon midfielder Danielle van de Donk tells DAZN.
She's right, the pressure remains on Lyon to do something in this tie.
Chelsea 0-0 Lyon (Agg: 1-0)
That will be that for this half.
Entertaining first half, all still to play for.
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Stephen: Really enjoying the Chelsea v Lyon match, top quality football on display, anyone's game so far.
Chelsea 0-0 Lyon (Agg: 1-0)
Karen Bardsley
Former England and Manchester City goalkeeper on BBC Radio 5 Live
Lyon always come out really hard and then it looks like they fatigue a bit.
Chelsea have grown in confidence and have reclaimed control, got up the pitch and released the pressure.
The pressure is on Lyon. They have to get on the scoresheet.
Chelsea 0-0 Lyon (Agg: 1-0)
We'll have two minutes added on at the end of this half.