The 14 teams were place into four groups in total, two with four teams and two teams with three. In each group, teams will play against each other once in a round-robin format. The top two in each group advance to the next round.
Teams are ranked according to points (3 points for a win, 2 points for a penalty shootout win, 1 point for a penalty shootout loss, 0 points for a loss), and if tied on points, the following tiebreaking criteria are applied, in the order given, to determine the rankings:
Points in head-to-head matches among tied teams;
Goal difference in head-to-head matches among tied teams;
Goals scored in head-to-head matches among tied teams;
There was no draw, rather the groups were pre-selected for geographical reasons on 11 August 2025 in Zagreb, Croatia.[1][2](H) indicates which clubs is hosting a group.