The draw for the group stage took place on 22 August at the AFC House in Kuala Lumpur, Malaysia. The 18 teams were drawn into five groups: three comprising four teams from the West each (Groups A–C) and two involving three teams from the East each (Groups D–E).[2] Teams were seeded into pots: four pots for West region and three pots for East region, and drawn into the relevant positions within each group, based on their association ranking. Teams from the same association could not be drawn into the same group.
In the group stage, each group will be played in a single round-robin format on a centralised venue. Eight teams will progress to the quarter-finals of the knockout stage : the three group winners and best-ranked runners-up from the West, and the group winners and runner-ups of each group from the East.
Tiebreakers
The teams were ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss). If tied on points, tiebreakers were applied in the following order (Regulations Article 8.3):[3]
Goals scored in head-to-head matches among tied teams;
If more than two teams were tied, and after applying all head-to-head criteria above, a subset of teams were still tied, all head-to-head criteria above were reapplied exclusively to this subset of teams;
Goal difference in all group matches;
Goals scored in all group matches;
Penalty shoot-out if only two teams playing each other in the last round of the group are tied;
Disciplinary points (yellow card = 1 point, red card as a result of two yellow cards = 3 points, direct red card = 3 points, yellow card followed by direct red card = 4 points);
