World Rugby has announced a new competition starting in 2026 as part of a “significant overhaul” of the men’s international calendar.
The tournament will be made up of 24 teams, split into two divisions with 12 teams in each, with promotion and relegation starting from 2030.
The top division will include the 10 sides from the Six Nations and Rugby Championship, plus two unnamed others.
The World Cup will also be expanded to 24 teams from 2027.
The new competition – yet to be given an official name – will be played in July and November, replacing the current summer and autumn international windows.
It will take place in alternate years, excluding those which will include the World Cup and British and Irish Lions tours.
Reforms to the women’s game mean there will be no overlap between international and club fixtures for the first time from 2026.
“Agreement on the men’s and women’s global calendars and their content is the most significant development in the sport since the game went professional,” said World Rugby chairman Sir Bill Beaumont.
“[It is] a historic moment for our sport that sets us up collectively for success.
“We now look forward to an exciting new era commencing in 2026. An era that will bring certainty and opportunity for all.
“An era that will support the many, not the few, and an era that will supercharge the development of the sport beyond its traditional and often self-imposed boundaries.
“I would like to thank all my colleagues for their spirit of collaboration. We have achieved something special.”
The future changes have been announced four days before the winners of the Rugby World Cup will be crowned, with New Zealand facing South Africa in the final in Paris on Saturday.