The Premiership will expand to 14 clubs from 2022-23, with relegation temporarily paused in a bid to improve the financial situation of clubs hit by the pandemic.
Premiership leaders Bristol's game against London Irish at Ashton Gate on Saturday has been cancelled because of positive coronavirus tests in the London Irish camp.
Bristol were controversial winners against Leicester following confusion over John Afoa taking the feild, while Tom Willis scored a last-second try to win it for Wasps.
Pat Lam says Bristol's Gallagher Premiership clash against Leicester on Saturday is important "to keep control of our destiny" as the play-off countdown continues.
Recap Friday's Premiership action as Gloucester beat London Irish with the final kick, and Sale secured a playoff spot by beating Bristol.
Sam Simmonds broke the record for tries scored in a Premiership season as Exeter swept aside London Irish 31-12 in Brentford.
London Irish have reported a "racially abusive and threatening message" sent to Fijian forward Albert Tuisue to Instagram and the police.