The FIFA Council has rubber-stamped plans to expand the World Cup to 48 teams from 2026 onwards, adding 16 extra nations.
FIFA president Gianni Infantino's revamp plan received unanimous backing at a meeting in Zurich on Tuesday.
Delegates were asked to vote on four proposals to change the existing format or stick with the current format of 32 teams.
This is the first time since the 1998 World Cup that changes have been made to the make-up of the tournament, with the 2026 competition set to feature 16 groups of three.
Infantino's preferred option for change was for a 2026 competition featuring 16 groups of three, followed by a 32-team knockout, increasing the number of games from 64 to 80 but remaining inside a 32-day schedule.
There were also options to have a 40-team tournament, with 10 groups of four or eight groups of five, but the only other 48-team make-up would see a 32-team one-game knockout round with the winners joining 16 already-qualified teams.
Infantino has also suggested that penalty shootouts be brought in to settle the results of all drawn games, thereby minimising the risk of teams colluding in their final group games to eliminate others from the tournament.
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