Back-to-back Premiership winners Saracens breached salary-cap rules in each of the last three seasons, but retained their titles.
Professional sport in the UK moved a step closer to returning on Wednesday as the government approved phase one of a return to training.
An easing of lockdown measures means rugby players could return to training, but the RFU says further work is needed before that can happen.
The Highlanders confirmed the signing of former All Blacks wing Nehe Milner-Skudder.
With bigger post protectors for safety reasons, a try will no longer be scored by touching the ball against an upright.
Jordi Murphy and Will Addison have signed contract extensions with Pro14 side Ulster.
Kurtley Beale and Luke Jones are returning to Europe to join top 14 heavyweights Racing 92 next year.
Professional sports in England could theoretically return behind closed doors by June 1, though strict government criteria must be met.
Super Rugby Aotearoa, to be played by New Zealand's five teams, will begin on June 13.
Benjamin Fall has left Montpellier after six years with the club and is unsure where he will be playing next season.