The two organisations announced on Monday that, despite their best efforts, travel restrictions due to COVID-19 meant the team couldn't prepare adequately in time for a planned July 3 kick-off.

If able to enter Australia, the Sunwolves would still be required to complete a 14 day quarantine period confined to a hotel before they could begin training.

The team, who were part of the Australian Super Rugby conference, would also need to establish a permanent base in Australia for the duration of the 12-week competition.

Rugby Australia interim CEO Rob Clarke said while they wanted the Sunwolves to join the four Super Rugby teams plus the Western Force in this year's revamped competition, it wasn't feasible.

"There are significant challenges facing the Sunwolves' participation in this modified competition model which Rugby Australia, SANZAAR and the Sunwolves have been attempting to work through," Clarke said in a statement.

"However, the reality is, given the timeframe available the team's preparation for the competition would be severely compromised.

"While unfortunate, this decision delivers the certainty that all stakeholders require at this point in time."

Australian Associated Press