Cavani heads in unmarked from Matuidi cross
Ivanovic heads Blues in front
Goal created by Terry cross and Cahill flick-on
Some defending to do for Diego Costa as he volleys clear an Ezequiel Lavezzi free-kick. The striker then gets back up the pitch as Cesc Fabregas tries to make something happen on the right, but he can't get past Maxwell.
Image source, Getty ImagesDidier Drogba looks deep in thought sat on the Chelsea bench. Does Jose Mourinho bring him on for Diego Costa, who has been very quiet?
Drogba has scored against PSG for Guingamp, Marseille and Chelsea, but his only goals at Parc des Princes were a brace back in 2004 - Jose Mourinho's first European game in charge of Chelsea.
Farhan Ahmed: This is Jose's Chelsea. The man gets results when it matters, how do you explain Chelsea always scoring against the run of play?
Chris Barbrook: I'd take Ibrahimovic over Costa. Costa gets too many suspensions - he'll be sent off before the end of the match!
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Image source, Getty ImagesThis could make things interesting. Xabi Alonso is sent off for Bayern Munich against Shakhtar Donetsk on his 100th Champions League appearance. It is still goalless, the home side could fancy themselves now.
Image source, APEdinson Cavani is giving the Chelsea defence plenty to think about and Branislav Ivanovic has no intention of letting him get away, fouling the striker and getting a yellow card. Ezequiel Lavezzi takes the free kick and David Luiz's header is pushed over by Thiabut Courtois. Close.
Bristol City have strengthened their grip on the game against Peterborough at the start of the second half with Kieran Agard making it 2-0 courtesy of his ninth goal of the season. Elsewhere, Niall Canavan has given Scunthorpe the lead against Chesterfield. There has also been a early goal in the Championship, and it has gone to Rotherham, who have reclaimed the lead against Derby thanks to Richard Smallwood's free-kick. It is half-time at the Madejski Stadium, where Jason Pearce's first goal for Wigan has given them a 1-0 lead at Reading and the scent of a first league win in eight games.
Image source, Getty ImagesDavid Luiz coaxes a bite out of Diego Costa, going in heavy on the Chelsea striker with a challenge and Costa stands up to the former Chelsea defender, puffing out his chest but keeps his cool, for now.
Former Man Utd and England full-back Phil Neville
in Paris for 5 live Sport
"Chelsea are dropping far, far too deep. They need to enjoy some possession of the football, because they are currently inviting pressure. But this is fantastic from PSG, forcing Courtois into an excellent double save."
Image source, APChelsea are hanging on now as a rampant PSG charge forward, urged on by the vocal home crowd. First, Thibaut Courtois denies Zlatan Ibrahimovic's close-range drive but the ball runs loose, Ezequiel Lavezzi pounces on it and looks certain to score, but Cesar Azpilicueta clears off the line.
Andrew Anderson: Cavani scores, game on! Forgot he was on the pitch if I'm being honest.
Ash Williams: How can none of the five Chelsea players pick up Cavani? Shocking. Come on PSG!
Shohidur Rahman: Free header against Chelsea defence? That's a gift.
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Still, Chelsea have that all important away goal. They attempt to grab a second as Cesc Fabregas whips in a corner, but it is too close to Salvatore Sirigu, who confidently claims the ball.
Image source, EPAIt is goalless in the other Champions League game between Shakhtar Donetsk and Bayern Munich.
The German side, who won 8-0 in the Bundesliga at the weekend, have managed just a solitary shot on target. Surely things will get better in the second half?
Keep an eye on the action in our separate live coverage.
Former Man Utd and England full-back Phil Neville
in Paris for 5 live Sport
"That's the first time in the game that PSG have got players en masse in the box. That's where Cavani likes to play, on the edge of the six yard line. A mistake from Gary Cahill who got sucked towards the ball, but a great header from Cavani, into the ground and in."
Image source, Getty ImagesThere it is! PSG are level and it is poor from a defensive point of view for Chelsea. Blaise Matuidi floats a perfect cross into the middle area and Edinson Cavani is allowed all the space in the world to rise and head in. Too easy.
The referee finally dips into his pocket for a card, booking PSG right back Gregory Van der Wiel for a foul on Eden Hazard.
Branislav Ivanovic wanders forward once again and he is picked out by Eden Hazard on the right, The full-back crosses but can't find the yellow shirt of a Chelsea team-mate inside the area. Chance gone.
Former Man Utd and England full-back Phil Neville
in Paris for 5 live Sport
"PSG have upped the intensity, with Cavani now up front. They are offering sustained attacks, and Chelsea must ensure they do not drop off in this second half."
Bimma: Can't see PSG doing anything tonight. Chelsea too strong and tactically better.
Objective Kritic: Chelsea have to raise the intensity and show we are the better prepared and rested team in the second half. Let's kill the tie, lads!
Deniz Eras: The game is not over. Chelsa need to keep focusing and bring the game to PSG. Let's attack and win for once, not park the bus!
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Image source, APWith the words of Laurent Blanc most likely still ringing in their ears, PSG are unsurprisingly quick on the attack.
Marco Verratti cleverly flicks the ball over two defenders for Maxwell, who makes the return pass on the left side of the Chelsea area. Verratti then tries to wriggle his way into the box but the ball gets caught under his feet and Chelsea clear.
We are back under way.