FIFA's ruling council on Tuesday unanimously approved an expansion of the World Cup to 48 teams in 2026, in a major coup for the body's president Gianni Infantino.
In a bid to widen the game's global appeal and enrich its coffers, the FIFA panel endorsed a format with 16 groups of three nations, a tweet from FIFA's official account said.
The move represents the first major change to the World Cup format since the tournament was boosted from 24 to 32 teams for the 1998 tournament in France.
Infantino took charge of scandal-tainted FIFA 11 months ago with a vow to repair the damage done at the end of Sepp Blatter's tenure by growing football across the globe.
Enlarging the World Cup, the planet's top sporting competition, was the centrepiece of that plan.
The controversial proposal faced tough criticism in some of football's key camps, including warnings that it would dilute the quality of play and overburden already exhausted players.
But Infantino had in recent weeks voiced confidence that his flagship project would be approved.
The FIFA chief has noted that a bigger tournament would beef up FIFA's coffers.
And a confidential FIFA report seen by AFP projects a 48-team tournament would bring a cash boost of $640 million (605 million euros) above projected revenues for next year's finals in Russia.
Africa and Asia could be the big winners with a rise in their number of places -- currently at five for Africa and between four and five for Asia.
But in order to smooth over scepticism about World Cup reform within UEFA, it is likely that Europe will also see its allotments rise above the current 13 places.
A source close to FIFA told AFP that under the new format Europe could get 16 places, with Africa earning nine.
But that information remained unconfirmed and world football's governing body was not expected to immediately announce its final decision on allotments, which may fuel a tough debate in the months ahead.
The council officially weighed five proposals during Tuesday's meeting at FIFA's snow-covered Zurich headquarters, including maintaining the status quo of 32-teams.
The landmark decision to expand the tournament is the latest overhaul of the World Cup, which has seen its global popularity and financial might surge since the inaugural edition in 1930.
That contest, won by Uruguay, had just 13 countries.
The World Cup expanded to 24 teams in 1982 in Spain before moving to its current 32-team version at France 1998.
The format approved Tuesday envisages 80 matches -- 16 more than the current set up -- but crucially will still be played over the same 32 days.
Two teams from each group will advance to a 32-nation knock-out round.
Some have pointed to Euro 2016 -- which expanded to 24 nations -- as evidence that competition can remain fierce with more countries involved, noting the stunning achievements of football minnows like Iceland and Wales.
Bidding to host the 2026 tournament has not yet opened, but Infantino has voiced support for two countries sharing the duty, easing the financial burden on a single host nation.
Sources close to FIFA have said that a joint US-Canada bid, possibly involving Mexico could emerge, while Morocco has also been mentioned.
What they said
We understand that this decision has been taken based on political reasons rather than sporting ones and under considerable political pressure, something ECA believes is regrettable.
- European Club Association
It's a great idea. Having more teams will inspire people to get out on the pitch.
- Diego Maradona
The World Cup is a fiesta of football so the more teams, the better.
- Carlos Puyol
It's incredible. If they are trying bring an end to the World Cup they only need to continue on the same path. This is no longer my World Cup. I'm absolutely horrified.
- Berti Vogts
Thank you for bringing the World Cup closer to the poor.
- Samuel Eto’o