Governing body Celtic Rugby is set to decide next week whether to invite South African teams Southern Kings and Cheetahs into the Pro12 competition.
Board members are due to meet in Dublin on Tuesday, 18 July to discuss the tournament’s immediate future.
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It is expected they will confirm the South African franchises are to join from September, alongside 12 teams from Wales, Ireland, Scotland and Italy.
The revamp could see the league divided into two conferences of seven teams.