Iranian women were first allowed to watch football at stadiums, but not during ACL games. Before that, FIFA had pressured Iran to let women into the stadiums; Iran relented, but capped the number of women to watch the 2018 final. In 2021, the AFC investigated the matter, in the hope of allowing unrestricted attendance whenever Iranian clubs are involved. Format Qualification As of the 2021 edition of the tournament, the AFC Champions League has commenced with a double round-robin group stage of 40 teams, which is preceded by qualifying matches for teams that do not receive direct entry to the competition proper. Teams are also split into east and west zones to progress separately in the tournament. The number of teams that each association enters into the AFC Champions League is determined annually through criteria as set by the AFC Competitions Committee. The criteria, which is a modified version of the UEFA coefficient, measures such thing as marketability and stadia to determine the specific number of berths that an association receives. The higher an association's ranking as determined by the criteria, the more teams represent the association in the Champions League, and the fewer qualification rounds the association's teams must compete in. Tournament The tournament proper begins with a group stage of 40 teams, divided into ten groups. Seeding is used whilst making the draw for this stage, with teams from the same country not being drawn into groups together. The group stage is divided into two zones; the first zone is the five East Asian groups and the other zone is the five West Asian groups. Each team meets the others in its group home and away in a round-robin format. The winning team and the runners-up from each group then progress to the next round. For this stage, the winning team from one group plays against the runners-up from another group from their zone of the group stage. The tournament uses the away goals rule: if the aggregate score of the two games is tied after 180 minutes, then the team who scored more goals at their opponent's stadium advances. If still tied the clubs play extra time, where the away goals rule is no longer applied. If still tied after extra time, the tie shall be decided by a penalty shootout. East and West zones continue to be kept part until the final. The group stage and