With the tournament five games per team old, many of Europe's top clubs have already booked their place in the last 16 of the Champions League.
Below we take a look at who already has and who still can qualify in each of the competition's groups:
Group A
Already qualified: Manchester United
Could qualify: Shakhtar Donetsk, Bayer Leverkusen
Group B
Already qualified: Real Madrid
Could qualify: Juventus, Galatasaray
Group C
Already qualified: PSG
Could qualify: Olympiakos, Benfica
Group D
Already qualified: Bayern Munich, Manchester City
Could qualify: No teams
Group E
Already qualified: Chelsea
Could qualify: Basel, FC Schalke
Group F
Already qualified: No teams
Could qualify: Arsenal, Borussia Dortmund, Napoli
Group G
Already qualified: Atletico Madrid
Could qualify: Zenit St Petersburg, Porto
Group H
Already qualified: Barcelona
Could qualify: AC Milan, Ajax