Wellington Rugby is heading into the blue to protect its players from the ongoing effects of concussion.
Starting this Saturday, referees in Wellington's College Sport premier one division will be able to issue a blue card to any player they suspect to have suffered a concussion.
And from June 11, the same rules will apply to the men's senior club premier and premier reserve grades during the second round of those competitions.
Players who receive a blue card must leave the field immediately and will then be formally subject to the existing minimum mandatory stand-down periods before they can return to play. Those are set at 21 days for senior players and 23 for those who are under 19.
WRFU head of community rugby Will Caccia-Birch said the blue card was designed to prevent players from retuning to training or playing before they had gained an appropriate medical clearance.