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Live updates
19:41 BST - FULL-TIME: Barcelona 6-1 Olympiacos; Karait Almaty 0-0 Pafos.
19:24 BST - To keep you abreast on tonight's earlier matches, Barcelona are now 6-1 up against 10-man Olympiacos -- with Marcus Rashford scoring twice, while Pafos are fighting hard to keep things at 0-0 in Almaty after having one of their defenders sent off in the opening five minutes.
18:46 BST - The team news for Man City, Arsenal and Newcastle's matches is... LIVE! Check out who starts for whom below.
18:31 BST - We've just hit the 45-minute mark in tonight's earlier matches, with Barcelona now 2-0 up (another for Fermin Lopez) and 10-man Pafos still hanging on to 0-0 in Almaty.
18:05 BST - There has been a goal and a red card in tonight's earlier matches. Barcelona wasted no time breaking the deadlock against Olympiacos, with Fermin Lopez on target after seven minutes.
Meanwhile, Pafos defender Joao Correia was given his marching orders after just four minutes.
17:00 BST - Good evening! Welcome to our rolling coverage of tonight's Champions League action, kicking off with Barcelona v Olympiacos and Kairat Almaty v Pafos -- both at 17:45. Click the links for live coverage of those matches.
Immediately after those games, we have a host of exciting clashes in store for us tonight -- involving Manchester City, Arsenal and Newcastle.
The Citizens are away at Villarreal, while Mikel Arteta's men host Atletico Madrid. The Magpies are up against Benfica on home soil. You can expect team news for these three matches at around 18:45.
For all of our live Champions League coverage, follow this link.
