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Live updates
20:15 BST - GOAL! Manchester City double their lead thanks to a neat finish from Phil Foden.
20:12 BST - GOAL! Celtic respond through Daizen Maeda, but moments later Karim Adeyemi smashes one from distance to make it 2-1 in just the first 12 minutes. Yikes.
20:10 BST - GOAL! Manchester City take an early lead through Ilkay Gundogan, who sees his shot deflect into the net.
Celtic are also behind in Dortmund after Kasper Schmeichel saves a penalty only to see Emre Can knock in the rebound.
20:00 BST - We're underway in each of tonight's remaining Champions League matches.
19:08 BST - Celtic will be hoping to build on the momentum of a big opening win in the Champions League this season, but they face a stiff challenge in last year's finalists Borussia Dortmund at Signal Iduna Park tonight.
Follow live audio commentary from 20:00 BST.
19:06 BST - Manchester City boss Pep Guardiola has stayed true to his word and put out a strong side to face minnows Slovan Bratislava this evening.
Follow live audio commentary from 20:00 BST.
19:04 BST - Arsenal welcome PSG to the Emirates this evening and it's as you were in terms of their first IX, with Mikel Arteta fielding the same starting line-up as they did against Leicester this past weekend.
Follow live audio commentary from 20:00 BST.
18:46 BST - Here's another quick reminder of all the juicy Champions League fixtures coming up this evening:
18:36 BST - Two games are already underway and have reached half-time in the Champions League, with Stuttgart and Sparta Prague all square and Brest holding a slender lead away at Salzburg.
Follow all the Champions League scores right here.
18:28 BST - PSG's Spanish manager, Luis Enrique, has a habit of beating his compatriot chums in competitive European matches, winning all of his encounters so far against the likes of Pep Guardiola and Unai Emery.
Will he be adding Mikel Arteta to that list of victims tonight?
18:25 BST - Unai Emery is hoping Aston Villa can summon the spirit of the club's 1982 European Cup final win over Bayern Munich when the German giants visit Birmingham in the Champions League on Wednesday.
"It is a special, special match for everyone," said Emery at his pre-match press conference on Tuesday.
"We are motivated and so excited to play tomorrow with our supporters in Villa Park. Remembering as well the final that Villa played against them 42 years ago."
16:13 BST - Xabi Alonso said yesterday that Bayer Leverkusen are expecting a typically dangerous game against Italian opposition when they host AC Milan tonight.
Milan made a poor start to the season, failing to earn a win in their opening three games, and while they also lost their Champions League game to Liverpool they have turned things around on the domestic front with three successive victories.
"An Italian team is always dangerous," Alonso said. "They know how to have patience. They are ready to defend low or to play with possession.
"Milan don't have to be dominant to be dangerous. Sometimes they have good possession, sometimes they have good counter-attacks."
15:04 BST - Here's how Arsenal have fared against PSG in recent meetings...
14:29 BST - Celtic are also in action this evening, facing the Bundesliga's Dortmund. Here's how Celtic got on against Slovan Bratislava last time out:
13:41 BST - Arsenal have a huge task on their hands tonight as they take on PSG. Click here to read all about how the Gunners' set-piece guru will be looking to dismantle the French giants.
12:17 BST - Pep Guardiola said yesterday he would not take Slovan Bratislava lightly in tonight's clash as his squad continues to adjust to life without key midfielder Rodri.
"When you have won four Premier League titles in a row in one of the toughest leagues in the world and a Champions League winner two years ago, we accept we are favourites when we play," Guardiola told reporters.
"They did not give me 2-0 before the game - it starts 0-0, same pitch. We have to prove it.
"We will put out the best team possible to compete and beat them.
"I have huge respect for them, and the patterns they make, but we will try to impose our game."
11:53 BST - Here is the full list of fixtures for today:
10:37 BST - Good morning and welcome along for a big day of Champions League action with teams such as Manchester City, Arsenal, Barcelona, PSG and Bayer Leverkusen all in action. We'll bring you all the big news and updates as the action unfolds across Europe.
