to games cancelled because of COVID-19. With this news it was also confirmed that the league's minimum standards criteria for promotion would be reviewed as would league structure from 2021–22. The new structure extended the moratorium on relegation for a further two-years. A playoff between the top team in the Championship and the bottom team in the Premiership is also introduced in the 2023–24 season. Financial Problems and Administration (2022) On 17 October 2022, Wasps went into administration, and were suspended from the league. Their upcoming fixture against Sale Sharks on 18 October, was also cancelled. On 28 October, it was confirmed that Wasps would be relegated to the championship, and any remaining fixtures expunged. Clubs Current clubs The Premiership began the current 2022–23 season with 13 clubs, but both Wasps Rugby and Worcester Warriors were removed from the league, and automatically relegated, after going into administration. Note: Capacity listed for rugby union games may differ from official stadium capacity All time A total of 28 clubs have been involved in the top-flight since the league's inception in the 1987–88 season. The most recent club to make its debut in the Premiership was London Welsh, which made their top flight debut in 2012–13. Three clubs — Bath, Gloucester and Leicester Tigers — have appeared in every season to date. Having come bottom of the table in the 2021/22 season Bath would have been relegated to the championship had it not been for the moratorium on relegation. Harlequins have only missed the 2005–06 season. Six other clubs have appeared in at least 20 seasons — Saracens, Northampton Saints, Sale Sharks, London Irish, Bristol Bears and Newcastle Falcons. The financial insolvency, expulsion and automatic relegation of Wasps during the 2022–23 season means their record of being ever-present effectively ended at the end of the 2021–22 season. Coventry, Liverpool St Helens, Moseley, Nottingham, Rosslyn Park, Rugby and Waterloo only appeared during the amateur era, whereas Exeter Chiefs, Leeds Tykes, London Welsh, Richmond, Rotherham Titans and Worcester Warriors have only appeared during the professional era. Below, the 2022–23 clubs are listed in bold; ever-present clubs are listed in bold italics. Years listed are the calendar years in which the seasons ended. All current teams will remain in the league until at least 2024. Sponsorship Structure Referees Referees in the Premiership are selected from the RFU's Professional Referee Unit. The Professional Referee Unit consists of