Postpublished at 20:47 Greenwich Mean Time 10 December 2014
As it stands, Barcelona will finish top of Group F. There's 45 minutes left. Can Paris St-Germain respond? The second-half is about to start.
Barcelona win group F
PSG finish as runners-up
Home side come from behind to win
Neil Johnston
As it stands, Barcelona will finish top of Group F. There's 45 minutes left. Can Paris St-Germain respond? The second-half is about to start.
OptaJoe on Twitter:, external Lionel Messi has equalled Raul's record of 75 goals in Europe's major competitions.
Andy West
Spanish football writer
"Fascinating formation/strategy from Barcelona's Luis Enrique. Potentially even revolutionary. Very, very different. I Really hope it's more than just a one-off. There's a lot to like about Barca's 3-4-3. Messi, Suarez, Pedro, Neymar and Iniesta in same line-up, for starters. Huge attacking potential. But it's very risky and requires a lot of work defensively. It demands a huge amount of running from Pedro and Neymar, who have whole wing to cover.
"One thing's certain: that half was the most fun I've had watching Barca in a long, long time. And from the Camp Nou reaction, fans felt the same."
This is turning into one of those 'I was there' games. Wonderful entertainment at the Nou Camp. It's advantage Barcelona thanks to Messi and Neymar. But don't write off PSG and Ibrahimovic yet.
Out of this world. Sublime. Breathtaking. Sensational. Neymar's goal was all that and more. You'll be hearing a lot more about that finish, believe me.
Take a bow, Neymar. The Brazilian spent the first 15 minutes of the game hobbling after a challenge but there is no stopping the forward as he power towards the PSG goal before dispatching a superb curling 25-yard shot that nestles in the corner of the bet. World class.
Brilliant one-touch football from Barcelona results in a chance for Luis Suarez but his fierce effort is kept out by Salvatore Sirigu. The hosts are upping the tempo in the closing stages of the first half.
Barcelona have had 61% possession and four attempts on goal. But they are still on level terms. The first signs of frustration from the home fans after a stray pass. PSG looking comfortable.
Television replays pick up on Laurent Blanc's reaction to that miss by Lucas. Let's just say the PSG boss doesn't look amused. Barcelona's defending is suspect to say the least.
How did Lucas miss? If Paris St-Germain don't qualify as group winners then they will regret that. Blaise Matuidi whisks in a super cross for the Brazilian midfielder but he fires wide from close range.
Paris St-Germain are still in the driving seat as far as Group F is concerned but Barca are coming at them. A second home goal and it's all change at the top of the group.
One chance each. One goal each. That's why Lionel Messi and Zlatan Ibrahimovic are world beaters.
Anything Zlatan Ibrahimovic can do, so too Lionel Messi. The Barcelona striker nets Champions League goal number 75 with a right-foot close range finish after Javier Mascherano's initial long ball forward is hooked across the six-yard area by Luis Suarez. What a game.
You can't give Zlatan Ibrahimovic that amount of space! The unmarked PSG striker produces a low finish from 10-yards after being teed-up by Blaise Matuidi. Where was the Barca marking? That was terrible by the hosts.
Twelve minutes in and little from Zlatan Ibrahimovic so far. But we've heard that before. The 33-year-old PSG striker is coming into this game in hot form having netted four times in his previous three appearances.
Concerns on the Barcelona bench as Neymar is left limping after catching the heel of Lucas. The Brazilian is soldiering on for now, but he doesn't look happy.
Steve Crossman, football reporter for BBC World Service: "The feeling in Paris is that PSG will really send a message if they get a point or more at Camp Nou tonight.
"They were only a minute or so away from a semi-final spot last season and to prevent Barcelona from winning their group for the first time since 2007 would represent a significant coup."
Free-kick to Barcelona just outside the French penalty area. This is prime Lionel Messi territory. He eyes the net before running up...and fires narrowly over.
Lots of back slapping, smiles and handshakes between both sets of players in the tunnel before the game. The old pals act is over. Barca are playing a 3-4-3 formation with . Pique, Bartra, Mathieu at the back. Pedro and Iniesta are wide midfield, with Mascherano and Busquets in the centre of the engine room.
We're under way at the Nou Camp.