Three law variations covering red card replacements, captain's challenge and goal-line drop-outs will be used in the inaugural Guinness PRO14 Rainbow Cup.
Newcastle, Northampton, Leicester and Benetton booked their places in the Challenge Cup quarter-finals on Saturday.
A round-up of Saturday's PRO14 action as Leinster ended Ulster's push for a place in the final, while Dragons and Glasgow also picked up wins.
Scarlets kept alive their Champions Cup qualification hopes with a bonus-point win over Benetton while Ospreys edged past Zebre.
Team news and the players looking to impress in Saturday's Guinness PRO14 action.
Wayne Pivac is under pressure to deliver performances after Wales slipped to seven defeats out of 10 Tests in 2020.
Leinster dominate our team of the week after their Guinness PRO14 derby victory over Munster, while a couple of French stars make up the half-backs.
Wayne Pivac knows that whatever allowances were made for Wales' poor performance in 2020 will not extend into this year's Six Nations.
Welsh rugby has secured a £13.5m funding package from the government to help soften the economic impact of the COVID-19 pandemic.
Rhys Webb responded to his omission from Wales' Six Nations squad with two tries in Ospreys' impressive 26-20 win at Connacht in PRO14.
Wales prop Tomas Francis will join Pro14 side Ospreys on a three-year deal from Premiership and European champions Exeter Chiefs at the end of the season.
We round up all of the action from Saturday's four matches in the PRO14 as Ospreys, Cardiff, Munster and Zebra all won.
Scarlets edged a hard-fought encounter against Dragons in Llanelli, while the Ospreys saw off Cardiff.
Recap Saturday's Boxing Day PRO14 action as Cardiff Blues and Scarlets picked up away derby victories over Dragons and Ospreys.
Leicester beat Bayonne, Ospreys were too strong for Worcester and London Irish claimed a bonus-point victory over Pau in the European Challenge Cup.
Wales captain Alun Wyn Jones faces a race against time to be fit for the start of this season's Six Nations Championship.
Wales head coach Wayne Pivac has made nine changes to the starting line-up for their final Autumn Nations Cup match against Italy in Llanelli on Saturday
Recap all of Sunday's PRO14 action as Ospreys, Leinster, Connacht and Ulster beat Benetton, Cardiff Blues, Zebre and Scarlets respectively.
Wayne Pivac has made 13 changes and named three uncapped players in his starting Wales team to face Georgia in Llanelli on Saturday.
We round up the weekend's PRO14 action as Scarlets won in Galway and Gavin Coombes starred for Munster.