The 24 teams in the top two tiers will be split into four pools of six with five group matches, followed by semi-finals featuring each pool winner in February 2024 and a final in March.
It is the first time in 18 years that Premiership sides will face lower-tier teams in a cup competition.They lost at Jersey Reds on Saturday, with the island side now favourites to take the title having got a two-point lead with one game to go - their 4,000 capacity ground at St Peter is also deemed unfit for top-flight rugby.
