FIFA will expand the World Cup to 48 teams, adding 16 extra nations to the 2026 tournament which is likely to be held in North America.
President Gianni Infantino's favoured plan — for 16 three-team groups with the top two advancing to a round of 32 — was unanimously approved Tuesday by the FIFA Council.
It meets Infantino's election pledge of a bigger and more inclusive World Cup going beyond European and South American teams, which have won all 20 titles.
"We have to shape the football World Cup of the 21st century," said Infantino, who also promised funding increases for FIFA's 211 member federations at his election last February.
With 80 matches instead of 64, FIFA forecasts the equivalent of $1 billion extra income at current rates from broadcasting and sponsor deals, plus ticket sales, compared to $5.5 billion revenue forecast for the 2018 World Cup in Russia.
FIFA projects an increased profit of $640 million despite some extra operating costs and prize money for teams.
FIFA's six continents should find out by May how many extra places they will each get.
"No guarantees have been made," Infantino said. "The only sure thing is that obviously with 48 teams everyone will have a bit more than they have today."
UEFA wants 16 European teams at the tournament, which is strongly favoured to be played in North America. The CONCACAF region has not hosted the World Cup since the 1994 tournament in the United States.
American, Canadian and Mexican soccer leaders have had informal talks about a co-hosting bid.
FIFA members are scheduled to pick the host in May 2020, though there could be little competition in a process Infantino said must be "bullet-proof" to meet all integrity rules.
Africa and Asia could be winners in a bigger World Cup with up to nine places each. They had only five and four teams, respectively, at the 2014 World Cup in Brazil.
Still, FIFA said it expects the standard of soccer to drop compared to the 32-team format locked in for the next two World Cups in Russia and Qatar.
The "absolute quality" of play, defined by high-ranked teams facing each other most often, is achieved by 32 teams, FIFA acknowledged in a research document sent to members last month. It made 10,000 tournament simulations to reach that conclusion.
Instead, Infantino wants to create fervour and months of anticipation back home in the 16 extra nations which would qualify, some probably making their World Cup debut. FIFA has pointed to Costa Rica, Wales and Iceland as examples of teams which overachieved at recent tournaments.