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19:10 BST - The team news for Arsenal and Aston Villa's clashes has landed! Check out who starts for who below.
19:00 BST - A little update on tonight's early kick-offs as Milan now lead Brugge 2-1 and Monaco have extended their lead over Red Star to 3-1.
18:40 BST - We have reached half-time in both of tonight's early kick-offs in Europe. Check out some key stats below.
18:20 BST - There have been a few goals in tonight's early matches already. Former Liverpool winger Takumi Minamo struck for Monaco before Red Star levelled things up at 1-1.
And, over in Italy, Milan have just about taken the lead over Brugge. Former Chelsea man Christian Pulisic finding the net there. About 10 minutes of the half left to play.
18:00 BST - A bit of non-Champions League news to bring you now as Anthony Gordon has pledged his long-term future to Newcastle United.
"I just think the club's in a great place. Since the takeover it's just been up and up. Me and the gaffer are a perfect match in terms of style of play. I love it here," the former Everton winger is quoted as saying.
"I'm very happy here, I like living here, the team is very suited to me and I'm here to win a trophy. The short story is we need to win a trophy."
16:45 BST - In tonight's first pieces of action, an hour from now, Serie A giants AC Milan are up against Belgian side Brugge and Monaco take on Red Star. Click the links below to follow those matches live.
Later, Premier League outfits Arsenal and Aston Villa are involved. The Gunners host Ukraine's Shakhtar Donetsk and Villa welcome Bologna to the West Midlands. Click below to check out our build-up content.
Another match to keep an eye on later has Jude Bellingham's name written all over it as Borussia Dortmund travel to Real Madrid. Click below for more.
Real Madrid v Borussia Dortmund
Click here to follow all of tonight's Champions League action!