Phil McNulty
BBC Sport chief football writer at Stamford Bridge

"All sorts of little sub-plots developing here - not least between PSG's former Chelsea defender David Luiz and Diego Costa. Luiz laid Costa out away from the gaze of the referee Bjorn Kuipers - but fair to say Chelsea's striker let Luiz know he had made a mental note of the incident."

Mark Lawrenson
Former Liverpool defender, BBC Radio 5 live

"He's caught him... it's what is called a stonewaller."

Image source, Reuters

It's all going off now! Diego Costa with a brilliant jinking run, he beats two men, gets a lucky ricochet and then appears to be tripped by Edinson Cavani.

Referee Bjorn Kuipers has a long, hard look. A little think - and then waves play on.

Costa beats the ground in frustration, Jose Mourinho just laughs his head off. Elsewhere in London, Chris Kamara picks up the phone and books an interview for the morning...

Mark Lawrenson
Former Liverpool defender, BBC Radio 5 live

"The trouble is they are all acting. There's no way of knowing. Mourinho is having a word with Costa. He's probably saying something like 'we have got 11 against 10. Do not do anything stupid'

Sparky. Sporty. This is like an El Clasico of a few years back when Jose Mourinho was in charge of Real Madrid. Now Diego Costa is down, holding his face, after another off the ball clash with David Luiz.

That's one each now. More red cards to come?

John Terry has to react brilliantly to head clear under pressure from Edinson Cavani. David Luiz and Branislav Ivanovic debate the merits of Zlatan's sending-off at the corner and Thibaut Courtois starts a counter with a cracking throw-out. Eden Hazard does Blaise Matuidi on the turn and the midfielder is booked.

Alan in Devon: And with that red card it's game over at Chelsea. Mourinho's pre-match comments around PSG's rough house tactics have done the trick. Despite his team being second best it's another master stroke. The man is brilliant.

Chelsea manager Jose Mourinho said before the game that PSG were 'the most aggressive side' he'd faced this season. Art imitating life?

Oscar has been booked and is late again, he gets away with one there.

Eloise Cropp:, external Not a red in my opinion, the over-reaction of Oscar and the Chelsea players swayed the decision.

John Dunthorne:, external Foot high but I'm not sure it was a red card.

Howard Horner:, external Chelsea's players may have reacted, but I don't think there was anything cynical in the action. Their anger was genuine.

Image source, AFP

Bayern Munich are also playing against 10 men and they are now heading into the last eight - surely. Former Manchester City defender Jerome Boateng buries the loose ball after Robert Lewandowski's shot was blocked.

Follow that match here.

Mark Lawrenson
Former Liverpool defender, BBC Radio 5 live

Image source, Getty Images

"Straight away every Chelsea player reacted. It was a really, really bad tackle. But do you know what...I don't think Zlatan Ibrahimovic meant it. I hate to say it's not like him but I think it's a poor excuse... and he's gone."

PSG's players are convinced that Chelsea's players had an impact on the referee for that card.

Image source, Reuters

Image source, AP

The tie explodes! Zlatan Ibrahimovic has had an anonymous first 30 minutes but now he's off. He and Oscar both slide in for a 50/50, Oscar gets there first and Zlatan collects him on the way.

It's a touch reckless, but not a proper two-footed job. Referee Bjorn Kuipers shows a red instantly though, and there's a bit of a 'fracas' in the aftermath too. PSG look rattled.

Mark Lawrenson
Former Liverpool defender, BBC Radio 5 live

"It's a fascinating game but there hasn't been a shot. We're not surprised."

Chelsea go through if it stays 0-0. of course. I suspect that Jose Mourinho will be pleased enough with this.

Phil McNulty
BBC Sport chief football writer at Stamford Bridge

"PSG coach Laurent Blanc showing frustration as, not for the first time, his side just fail to provide end product to slick approach work. This is, so far, a much more accomplished performance from PSG than their timid effort in the Champions League here last season. Zlatan Ibrahimovic, however, has been a peripheral figure and PSG need that to change."

We were spoiled last night as the high lines, naive defending and youthful approach of Schalke, sprinkled with one or two genuinely world-class attackers, served us up a goal every 12 minutes or so in Madrid.

No such negligence at the back tonight. Both sides are keeping the back door double locked.

Again an offside flag aborts a good Chelsea attack, they are looking much more incisive now though. I can't offer you any bona fide chances, but we are getting closer to almost creating a chance...

Image source, AP

Chelsea's best move of the game sees Eden Hazard play a neat one-two with Ramires, David Luiz is suckered out of position but the offside flag incorrectly stops Hazard in his tracks as he breaks in on goal.

Bad call, but better play from the hosts.

Mark Lawrenson
Former Liverpool defender, BBC Radio 5 live

"Sloppy from Chelsea. I don't know if it's because Paris St-Germain are putting them under pressure. It was always going to be a tight tie. PSG have not had a shot on target yet. They're trying to walk the ball into the net."