Droll tweet of the night award....

Malcolm Jones‏: Celtic v Barcelona - great to have the football gods gracing the Parkhead turf. Good to see Barcelona too 

Tom English
BBC Sport Scotland

Mauricio Pellegrino, manager of newly-promoted Alaves, brought his team to Camp Nou in September and plotted a sensational 2-1 victory. He said afterwards that the first job when trying to beat Barca is convincing yourself that you're good enough to do it. When facing Barca, lots of teams are beaten before they even leave the dressing room.

Pellegrino played 5-4-1 and limited Barca to two shots on target. It can be done. His players worked and worked and worked to close space down. They lived in the faces of their glamorous opponents all night long. And they had a bit of luck

That's what Celtic need tonight. Intensity, aggression, discipline, concentration, ruthlessness if they get a chance to score. A massive job but where there's belief there is hope. The question - or one of them - is do Celtic really and truly believe?

Image source, Getty Images

Arsenal have made it past the group stages for the 14th consecutive season but have been knocked out at the last 16 stage in the last six campaigns.

Some excellent hamstring advice here....

Well, it has been a good week for goals in Germany in the Champions League....

Donald, Belfast

Phil McNulty
BBC Sport chief football writer at Emirates Stadium

PSG's side has a look of containment about it but they have suffered the considerable blow of losing Angel di Maria to injury and they are also without the influential Javier Pastore, who is unfit.

The strangest setback of all came yesterday when full-back Serge Aurier was stopped from entering the United Kingdom .

As the only team with a 100 percent record left in the competition Atletico Madrid are through and will be hoping to top Group D with one more win and manager Diego Simeone is likely to rest some players. 

At the other end of the spectrum, their opponents, PSV Eindhoven, have already been eliminated and haven't been in the best form recently - The Dutch champions have only won two of their last 10 matches in all competitions. 

Image source, Getty Images

Celtic have failed to keep a clean sheet in their last 17 Champions League games, their longest run without a shut-out in the competition.

Brendan Rodgers has won only one of his 10 group games as manager in the Champions League, that was against Ludogorets Razgrad (2-1) in September 2014 when he was in charge of Liverpool.

Image source, PA

"It is a luxury to be qualified after four games," said Arsenal boss Arsene Wenger this week. But he did say that he won't be resting players unnecessarily as he looks to top the group. 

Arsenal drew 1-1 away to PSG on 13 September, and Wenger added: "We have done the job in a convincing way.

"Now, we have to finish the job at home. We played a draw there and now it is down to us to win the game."  

Our colleagues in Scotland report that the Barcelona stars were all hoods and snoods during last night's training session at Celtic Park and it's MUCH, MUCH colder tonight, with the temperature around -2C.

MINUS TWO.

Image source, Getty Images

Image source, Getty Images

Just another logistical headache for PSG manager Unai Emery this week, when right-back Serge Aurier was stopped from entering the United Kingdom.

The Ivorian, 23, was given a two-month suspended prison sentence in September for assaulting a police officer.

PSG say the UK authorities granted Aurier a visa in October but revoked it on 16 November, citing his conviction.

Thomas Meunier starts at right-back instead. 

Now this would be a story.

Spanish prosecutors have called for Barcelona forward Neymar to be sent to prison for two years for his part in a corruption case over his transfer from Brazilian club Santos in 2013.

Judge Jose Perals also called for a five-year sentence for former Barcelona president Sandro Rosell and a fine of 8.4million euros (£7.2m) for the club.

It asked to drop charges against current president Josep Maria Bartomeu.

Rosell, Neymar and his father are set to stand trial.

The case stems from a complaint by Brazilian investment group DIS, which owned 40% of Neymar's transfer rights and alleges it received less money than it was entitled to from the transfer fee.

Image source, EPA

Steven Gerrard is punditing on BT Sport tonight and he has just confirmed that he was in talks to manage League One side MK Dons.

"I spoke to them, had a chat with the chairman," he said.

"It’s a very exciting job for someone else, it’s a bit soon for me though."

Image source, Reuters

Manchester City captain Vincent Kompany could be out for "weeks" after injuring his knee, says manager Pep Guardiola.

The 30-year-old Belgian was taken off during Saturday's 2-1 victory at Crystal Palace after being concussed, but also has knee-ligament damage.

Guardiola said Kompany is attending a Spanish hospital for treatment, adding: "He's sad but he is in the best hands."

Kompany, who has started two league matches this season, has already had calf, groin and thigh injuries in 2016.

It is his 35th separate injury since joining City from German club Hamburg in 2008.

Image source, Getty Images

Celtic took an absolute hammering in Barcelona in September, where Lionel Messi scored inside three minutes on his way to a hat-trick in a 7-0 humbling.

Containing Messi, Luis Suarez and Neymar is tough at the best of times but Celtic boss Brendan Rodgers reckons his team "clearly showed them too much respect."

Image source, Getty Images

"The players have shown from that game that they've changed," said former Liverpool boss Rodgers.

"It will be tough for us, of course, against a top-class team with arguably the best front three you could say has played for Barcelona, but I would hope it would be a different performance from us."  

Image source, Getty Images

Image source, Sergio Aguero

A nice, easy one for once.

Manchester City qualify with a win.

A draw will also be enough - if Barcelona beat Celtic. 

To stay in contention to finish in the top two, Celtic must win at home to Barcelona [easy right?] and hope that Manchester City do not win in Germany. 

Barcelona go through with a win in Glasgow, or with a draw if Manchester City do not lose. Barcelona will clinch the group if they win and City do not.

BBC Radio 5 live

A busy night of action on 5 live and 5 live Final Score.

Mark Chapman has been on air since 18:30 GMT. The main commentary game is Monchengladbach v Man City, John Murray joined by Pat Nevin for that one.

There will be a football social after tonight's matches - you'll be able to get involved by calling 0500 909693, text 85058 or tweet @5livesport.

Phil McNulty
BBC Sport chief football writer at Emirates Stadium

Image source, .

Arsenal manager Arsene Wenger insisted there would be plenty of time for Olivier Giroud to get his chance from the start after another goalscoring appearance as a substitute at Manchester United on Saturday.

And that chance comes tonight as he starts against Paris St. Germain in the Champions League, with Theo Walcott dropping down to the bench.

David Ospina is back as Arsenal's Champions League keeper instead of Petr Cech and Kieran Gibbs comes in for Nacho Monreal.

Gunners' boss Wenger has bolstered his midfield as Alex Iwobi comes in for Mohamed Eleny.