The matches, the ways to win, the links you need, the lowdown: our bitesize guide to Tuesday and Wednesday's UEFA Champions League action.
Article top media content
The key info
Group E: Sevilla v Maribor, Spartak Moskva v Liverpool
Group F: Manchester City v Shakhtar Donetsk, Napoli v Feyenoord
Group G: Beşiktaş v RB Leipzig, Monaco v Porto
Group H: Borussia Dortmund v Real Madrid, APOEL v Tottenham Hotspur
Group A: Basel v Benfica, CSKA Moskva v Manchester United
Group B: Paris Saint-Germain v Bayern München, Anderlecht v Celtic
Group C: Qarabağ v Roma, Atlético Madrid v Chelsea
Group D: Sporting CP v Barcelona, Juventus v Olympiacos
- All games at 20:45CET execpt Qarabağ v Roma (18:00CET)
How to follow
- Click on the match links for live coverage from our reporters, starting the day before the game
- Get involved on social media with @ChampionsLeague on Twitter and Facebook – where we go live!
- Live audio commentary and updates in our matchnight radio show on the official app or here from 19:30CET to 23:30CET on Tuesday and Wednesday – then download the podcast
- Where to watch: all of our TV partners
- Watch highlights of every game from 24:00CET on the night
Play and win
- Update your #UCL Fantasy Football team
- Guess the results with #UCL Predictor
- Vote and win on Thursday: Goal of the Week, Player of the Week
The big five: what to watch
- Together again, naturally
Dortmund and Madrid are meeting in this competition for the ninth time in five years, and those previous eight games produced 27 goals, including two 2-2 draws in last season's group stage. In these side's 12 meetings overall, there have been no away wins.
- The road to the (2019) final
Last week, Madrid's Estadio Metropolitano was picked to host the 2019 UEFA Champions League final and on Wednesday it stages its first European game as Chelsea visit Atlético, neither team having lost this season.
- Messi's latest milestone
After striking twice against Juventus a fortnight ago, Lionel Messi is stood tantalisingly on 99 UEFA club competition goals. Cristiano Ronaldo did make it there first last season, but if Messi reaches his century on Wednesday, he will have done so in 121 games to the 144 is took his Portuguese rival.
- Baku in the big time
Qarabağ become the first Azerbaijani team to stage a UEFA Champions League group game, welcoming Roma to Baku's Olympic Stadium, named last week as venue for the 2019 UEFA Europa League final.
- Match of the week?
Lots of candidates, but after their convincing opening wins, the showdown between Paris and Bayern stands out. Who would be surprised to see them meet again come May in Kyiv?