Borussia Dortmund, Atlético Madrid, Barcelona, Internazionale Milano, Ajax, Bayern München, Manchester City and Juventus could all book their UEFA Champions League round of 16 places with two games to spare on matchday four while ten other clubs are fighting to keep their hopes alive. UEFA.com explains the permutations.
All information in this article is subject to final confirmation from UEFA. These examples may not cover all potential situations.