Cavani heads in unmarked from Matuidi cross
Ivanovic heads Blues in front
Goal created by Terry cross and Cahill flick-on
Image source, Getty ImagesSo how have Paris St-Germain been getting on this season? They are third in Ligue 1, winning 15 of their 25 league games and are unbeaten in their last nine fixtures, winning seven of those games.
They did, however, throw away a two-goal lead at home to Caen on Saturday, both away goals coming in the final few minutes after the club's twitter feed, external had a little dig at Jose Mourinho...
Image source, TwitterSo Jose Mourinho is no stranger to "parking the bus" but it looks like Chelsea have taken it to a whole new level.
The Chelsea team bus apparently got stuck, external on the way into the ground today...
Image source, Getty ImagesZlatan Ibrahimovic and Edison Cavani start in attack for Paris St-Germain. David Luiz is named in defence to face his former club while Marquinhos plays after recovering from a hamstring injury.
Striker Diego Costa returns to the Chelsea team after missing three domestic matches through suspension, while midfielder Cesc Fabregas starts despite fears he would miss the match through illness.
PSG XI: Sirigu; van der Wiel, Silva, Marquinhos, Maxwell, David Luiz, Verratti, Matuidi, Lavezzi, Ibrahimovic, Cavani.
Chelsea XI: Courtois, Ivanovic, Cahill, Terry, Azpilicueta, Ramires, Matic, Willian, Fabregas, Hazard; Diego Costa.
As expected, Diego Costa starts for Chelsea against PSG. Thibaut Courtois is in goal for the Blues.
Image source, Getty ImagesGood news for Chelsea?
Paris St-Germain have a number of injury concerns after four players suffered injuries in the 2-2 draw with Caen.
Yohan Cabaye, Marquinhos and Serge Aurier all went off injured in the game, while Lucas had a groin problem.
We are expecting team news any minute now.
Image source, Getty ImagesWhich former player always seems to score against your club?
Danny Jones: Dare I say... Adebayor against Arsenal! Always entertaining to say the least!
Former Man Utd and England full-back Phil Neville
in Paris for 5 live Sport
"It's going to be a tough game for Chelsea. They lost here last year in the quarter-final 3-1, and PSG have got a formidable home record this season. I always feel with PSG they have wonderful individuals, but they are not as good a team as Chelsea, who are just a better unit. Chelsea defend better and are better organised.
"It's all about which of Costa or Ibrahimovic performs. If the defences dominate then it will be tonight, but if not there are going to be goals."
Image source, Getty ImagesThe French football media are not mixing their words when it comes to what they think about Jose Mourinho, with France Football labelling him, to put it politely, "a pain in the neck" and a "stirrer".
However, if things had worked out a little differently, they could have been singing his praises. Mourinho was previously wanted by PSG to be their new coach on two separate occasions - 2011 and 2013 - but he turned them down both times.
In the second instance, he was manager of Real Madrid, and Mourinho said: "It was a big challenge for me and a big challenge to compete directly against the best, Barcelona, probably the best team in Europe for the last decade for sure. It was not the right moment for me to go."
You can never quite tell with Jose Mourinho if he is paying someone a compliment, or having a cheeky dig.
While he claims Chelsea are a different team to the one that edged past PSG last year, he says the French side have barely changed in the subsequent 12 months.
"Paris is a great team - basically the same team as last season, with David Luiz," he said. "When you have stability you can always improve."
Steve Huish: Chelsea fans should thank PSG as David Luiz's transfer prevented them from failing Financial Fair Play (FFP) and receiving a €40 million fine.
Nishtar in Walsall: Are Chelsea the only team who could make a decent squad from their second team?! Look at all the attacking flair they possess!
Send us your thoughts using #bbcfootball, external on Twitter, text in on 81111 (UK only), or drop us a line on the BBC Sport Facebook, external or Google+ page., external
Image source, Getty ImagesWhich ex-player always seems to score against your club?
Jacob Smith:, external I'm a Chelsea fan but my dad pointed out how Yann Kermorgant always seems to score against Leicester.
BBC Radio 5 live
You can hear that famous Champions League theme tune blaring out on Radio 5 live once again this evening, as the nation's home of live sport jumps back on the bandwagon.
Previewing all tonight's action from 19:00 GMT, live commentary from Parc des Princes is in the company of 5 live senior football correspondent John Murray and former Manchester United and England full-back Phil Neville from 19:45 GMT.
Listen via the forthcoming link at the top of this page or on the BBC Sport and BBC iPlayer Radio apps, on digital television and radio and on 909 and 693 medium-wave.
Then, post-match, the 5 live Football Social kicks on from 21:40 - contact the programme by calling 0500 909 639, texting 85058 (both UK-only) or via social media., external
Image source, Phil NevilleFormer Manchester United defender Phil Neville: "Pitch looks good."
From Preston to Paris...
Phil Neville is part of the BBC Radio 5 live commentary team at the game. Here is a bit more about our coverage details...
There is always one former who player who has a knack of scoring against their former club. They might be a defender they might not score all season, but somehow they always manage it against the side they used to play for.
It could be David Luiz v Chelsea tonight, every club has one so, with that mind, which former player for your club do you dread seeing when they line up against your side, knowing full well they are going to score?
Let us know using #bbcfootball, external on Twitter, text in on 81111 (UK only), or drop us a line on the BBC Sport Facebook, external or Google+ page., external
Image source, Getty ImagesCould David Luiz come back to haunt his former club?
The Brazil defender will certainly be up for this game, but says he will show the club he won both the Champions League and the Europa League with "respect" should he score.
"I want to qualify, like I qualified last year, but I want to qualify for PSG," he said. "If I score against Chelsea I won't celebrate out of respect, but I will be happy."
Andy Brassell
European football expert
"This is not just a repeat of last season's thrilling quarter-final between the sides, but the occasion of David Luiz facing his old team-mates for the first time.
"Many raised their eyebrows when the French champions paid in excess of £40m for a defender who can be erratic and rash - especially after his nightmare display in Brazil's World Cup semi-final humiliation against Germany - but his impact at the Parc des Princes has been largely positive.
"Even if Luiz still has his share of heart-in-mouth moments and there is the feeling that PSG's transfer kitty might have been better spent elsewhere - they had to back out of a move for Angel Di Maria because of financial fair play restrictions - he has strengthened Laurent Blanc's side."
Read more from Andy Brassell on the Champions League in his feature.
Image source, Getty ImagesChelsea will come up against a familiar face tonight, with defender David Luiz in the Paris St-Germain side.
The Blues sold the Brazilian to PSG last summer for around £50m, and his departure funded the purchase of Diego Costa, Cesc Fabregas and Filipe Luis.
Image source, Gary Lineker/Twitter
Image source, Getty ImagesJose Mourinho may have complained that he had no "real strikers" after his side lost in Paris last year, but he would have no reason for such a complaint if they lose tonight.
The Portuguese coach has already confirmed he will play Diego Costa against PSG, with the striker having been serving a three-match suspension.
Costa has scored 17 goals in 19 Premier League games this season, and Mourinho said: ""Yes, I will start him, but it's not good for a player to be three matches without starting a game. So he's not in the best of condition."
Getting the excuses in already Jose....?
Image source, Getty ImagesThe Champions League is back, and what a way to return.
Two months after the group stage ended the knockout stage cranks into action with European heavyweights Chelsea and Bayern Munich kicking things off tonight.
Chelsea v PSG is our main focus but we will also be giving plenty of attention to Pep Guardiola's side as they travel to Ukraine to play Shakhtar Donetsk. We'll have separate live coverage of that game from 19:30 GMT.