The UEFA Champions League has reached the halfway stage, with all eight groups starting to take shape.
This is the final season of the multi-group format, before it becomes a 36-team competition with all clubs in one league table.
We take a look at who can seal their places on Matchday 4, and how the qualification picture looks.
The top two teams in each group qualify for the round of 16, the third placed clubs drop into the Europa League knockout playoff round, and those who finish bottom are eliminated.
Tiebreakers:
1) Points
2) Head-to-head points in games involving the tied teams
3) Goal difference in head-to-head matches involving the tied teams
4) Goals scored in head-to-head matches involving the tied teams
— If the above tiebreaker initially involves 3 or 4 teams, it is reapplied to resolve any remaining tiebreaker among fewer clubs
5) Goal difference in all group matches
6) Goals scored in all group matches
7) Away goals scored in all group matches
8) Wins in all group matches
9) Away wins in all group matches
10) Disciplinary points
11) UEFA club coefficient.
This page will be updated throughout the final rounds of the group stage.