The picture is becoming clearer for the 32 sides heading into the second half of the group stage. What headlines will matchday four bring?
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There will be a quick renewal of rivalries with the matchday three fixtures reversed this time around. Qualification or elimination is also possible for some; we pick out the games where drama is likely to unfold.
Matchday four fixtures (21.00CET unless stated)
Tuesday 6 November
Group A: Monaco v Club Brugge (18.55CET), Atlético Madrid v Borussia Dortmund
Group B: Tottenham Hotspur v PSV Eindhoven, Internazionale Milano v Barcelona
Group C: Crvena zvezda v Liverpool (18.55CET), Napoli v Paris Saint-Germain
Group D: Porto v Lokomotiv Moskva, Schalke v Galatasaray
Wednesday 7 November
Group E: Bayern München v AEK Athens, Benfica v Ajax
Group F: Lyon v Hoffenheim, Manchester City v Shakhtar Donetsk
Group G: CSKA Moskva v Roma (18.55CET), Viktoria Plzeň v Real Madrid
Group H: Valencia v Young Boys (18.55CET), Juventus v Manchester United
Three things to look out for this week
1) Atlético and Diego Simeone are far from familiar with heavy reverses. The 4-0 humbling at Dortmund on matchday three equalled the Spanish side's worst result in the competition and was their first four-goal defeat during the Argentinian's 391 games at the helm. However, Los Colchoneros' ability to bounce back should provide cause for optimism: Real Madrid beat Atleti 3-0 twice in 2016/17, but they responded with three wins and a draw from their next four matches on each occasion, while four consecutive victories followed a 3-0 loss at Villarreal.
2) Unlike their city rivals, Real Madrid are not among the eight teams that can book their qualification with two games to spare but a win in the Czech Republic will put the holders in sight of getting past the group stage for the 22nd season running. However, the focus will just as much be on their bench, where Santiago Solari, past of their 2002 victory as a player, is expected to still be in interim charge after the dismissal of Julen Lopetegui. The last time a player from the 2002 final team took over mid-season as Madrid coach after stepping up from the reserves, Zinédine Zidane led them to the 2015/16 UEFA Champions League title, and the two after that.
3) You have to go back to October 1997 for Thierry Henry's home debut in this competition – and it was a sign of things to come that he scored twice in Monaco's 4-0 victory against Leverkusen. The Principality side will hope to draw on the experience of France's record scorer when Henry takes charge of them in Europe at the Stade Louis II for the first time 21 years later. Inspiration is certainly required as the 1-1 draw at Club Brugge on matchday three means Monaco – semi-finalists in 2016/17 – are still without a win in the section.
How can I follow on UEFA.com?
UEFA.com has reporters at every UEFA Champions League game this season, providing regular updates on social media – Instagram, Facebook and Twitter – and in our MatchCentres. There is live text and photo coverage of every fixture, plus a live radio show, with reaction and highlights to follow.
How can I get involved?
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