Another team faces the chop from Super Rugby, and the conference system could be scrapped.
Japan's Sunwolves are the team in greatest danger according to the Sydney Morning Herald, in a report which says a return to the 14-team format was among formats discussed by SANZAAR.
A complicating factor is the cloud over South Africa's four teams, who are rumoured to be interested in joining European competitions.
The Sunwolves finished last in 2018 and despite some strong performances have struggled for overall credibility during four seasons.
With the competition limited to 22 weeks, a full home-and-away round robin is impossible.