Barcelona: ter Stegen, Sergi Roberto, Pique, Umtiti, Jordi Alba, Rakitic, Busquets, Andre Gomes, Messi, Luis Suarez, Neymar. Subs: Cillessen, Turan, Iniesta, Rafinha, Mascherano, Alcacer, Digne.

Celtic: De Vries, Lustig, Toure, Sviatchenko, Tierney, Roberts, Gamboa, Bitton, Brown, Sinclair, Dembele. Subs: Gordon, Izaguirre, Armstrong, Rogic, O'Connell, McGregor, Forrest.

Referee: Ovidiu Alin Hategan (Romania) 

PSG: Areola, Aurier, Marquinhos, Thiago Silva, Maxwell, Verratti, Krychowiak, Rabiot, Di Maria, Cavani, Matuidi. Subs: Trapp, Kimpembe, Lucas Moura, Thiago Motta, Pastore, Meunier, Jese.

Arsenal: Ospina, Bellerin, Mustafi, Koscielny, Monreal, Iwobi, Coquelin, Ozil, Cazorla, Oxlade-Chamberlain, Sanchez. Subs: Cech, Gibbs, Lucas Perez, Giroud, Holding, Xhaka, Elneny.

Referee: Viktor Kassai (Hungary)

Enough about the one game that is off - though we will bring you news on when that game will now be played - let's focus on our two active matches...

Arsenal have only met PSG once before, in the semi-finals of the 1993-4 Cup Winners' Cup, but they last played at the Parc des Princes a year later.

The final of the 1995 Cup Winners' Cup between Arsenal and Zaragoza was poised at 1-1 in the final minute of extra-time after John Hartson had equalised for the Gunners.

Image source, Getty Images

Then Nayim - formerly of Tottenham - took a shy from wide right, and pretty much on the halfway line. And scored!

Catching David Seaman out of position in the process...

The entire Monchengladbach squad comes out onto the pitch to salute their pocket of away fans, who are still in the stands singing their heads off. Superb support. 

Celtic's Twitter account is asking a lot is it not?

Arsenal manager Arsene Wenger, on BT Sport, is asked about his team selection: "I don't want to surprise, I just want to play a team that can perform. They made changes to adapt to us and we have made changes to stop them from playing too. 

"I have two world class goalkeepers, we analysed well last season and this season. I decided to play Ospina tonight. 

"It will be a big first test for the whole team, we have to do well and then be ambitious after that. 

"[Theo Walcott] has a knee problem and I think it's very short term but he was not completely fit so I left him at home." 

Mark: Wenger's key fault as a manager is his greatest strength as a man: he puts faith in and cares about the players as humans.

Emmanuel Ahaneku: No Cech in goal. No Giroud upfront. No Xhaka in the middle of the park. Is this a testimonial for Arsene in Paris???  

There's a lot of focus on Arsene Wenger's team. Be in touch with us whoever you support. We are waiting on #bbcfootball.

A reminder that there is a separate live page for the Celtic game here.

Pat Bonner
BBC Scotland pundit at Nou Camp

Image source, Getty Images

Celtic have to go and enjoy it. It's incredible they got through but they will have to play very very well tonight and hope they catch Barca maybe on the counter attack. They will have to keep tight lines. Coming here is demanding. The pitch is huge and they have got to work tight as a unit. Concentration absolutely key. They will not want to let Barca pick those little passes. If they get anything like a draw it will be an incredible result for them.

The pocket of away fans defiantly stand and chant, as if they can somehow overrule the decision and indeed the weather.

The game can't go ahead. Simple as that.

It's a sickener for those travelling fans in particular though. Who books a two-night stay for a midweek game? 

Simon Stone
BBC Sport at Etihad Stadium

There are safety issues, and the travel networks are in trouble. It is too much. I am led to believe that both clubs have had a say in this.

They will try and play this game tomorrow. But that is yet to be confirmed.

No surprise given the extent of the rain in Manchester. The match is OFF because of the adverse weather conditions.

A large number of Monchengladbach fans have been dancing in the rain with their tops off, for about half an hour. The camera has just picked out a man who looks like he's regretting that revelry as he wrings out his socks.

Here we have a quiz question classic for you. Who are the seven clubs Carlo Ancelotti has managed in the Champions League? He now holds a record. Answer below.

Image source, .

Answer: Parma, Juventus, AC Milan, Chelsea, PSG, Real and Bayern.

Feeling optimistic Celtic fans?Allow the stats of doom to threaten your mood:

Image source, Getty Images

Celtic have lost seven of their last eight Champions League games. 

Away from home in the Champions League, Celtic have lost 25 of their 27 games (W1 D1) and have never kept a clean sheet.

Celtic have also failed to keep a clean sheet in their last 13 Champions League games, conceding 27 goals along the way.

Head up... 

We are only 25 minutes from kick-off, there are hardly any fans inside the stadium and the pitch doesn't look too clever.

We could be facing at least a delay at the Etihad.

Image source, Getty Images

Pep Guardiola has reached the semi-finals in each of his seven seasons as manager in the Champions League (winning it twice) but has been knocked out at this stage in the last four campaigns.

Guardiola won only 33% of his Bundesliga games against Borussia Mönchengladbach with Bayern Munich (two out of six), his lowest ratio against any side he has faced at least twice in his career in the league as manager.

Chris Waddle
Former England winger in Paris for 5 live Sport

We know Arsenal are a good side, we've seen it. They always put runs together and then they go and slip up. Then they get the hard teams and end up going out. There are times for me where you think pick your strongest team and give yourself a chance.

I've always been a fan of Wenger as a manager. At the minute I can't see them winning the Premier League or this competition either.  If he doesn't finish top four I'm sure there will be demand for him to leave and he might think I'm not going through it again.