Former All Black Conrad Smith has warned players they hold the key to World Rugby's revised concussion protocols, requiring an extended stand-down period.
Faced with the increased legal risk of historic head injury claims, the sport's governing body has confirmed elite players with concussion symptoms face at least 12 days on the sidelines.
No player at any level will be allowed back on the field before the seventh day, even if they show no symptoms, and their return will have to be approved by an independent consultant.
In most cases the new protocols, which will come into effect from July 1, will prevent players from returning to action for their team's next game the following weekend.
But two-time World Cup winner Smith, who played 94 tests for New Zealand between 2004-15, insists players must take responsibility for their own recovery.
"The key to this working - and the important part in changing the culture around concussion - is that players report their head injuries and any symptoms," said the International Rugby Players head of welfare.
"Seeing first-hand the amount of work and research that is going into this extremely complex issue, I have confidence in the approach taken and that the authorities are looking after the player's best interests."
The protocols were amended following the latest review of scientific evidence and research by World Rugby's independent concussion working group, and officials said the changes were not in response to "external criticism" of some recent high-profile cases, where seemingly concussed players returned to action within a week.
"It's not just a new protocol, it's going to be a new mindset for coaches and players," said World Rugby's chief medical officer Dr Eanna Falvey.
"We recognise that there are differences in concussion symptoms and concussion history, and this process enables us to further protect elite players by individualising their rehabilitation."
In 2020, a group of former rugby players filed a class-action legal case against World Rugby and other governing bodies, alleging that their failure to protect them led to early onset of dementia.
The latest move on the recognition and treatment of concussion goes hand-in-hand with the game's attempt to cut down the frequency of incidents that cause it.
In recent seasons, there has been a radical shift in what is now deemed dangerous on the pitch, with yellow and red cards now frequently shown for collisions that would previously have been written off as accidental.
The overall aim is to educate players to tackle lower, minimising the risk of shoulder-to-head or head-to-head contact, which is responsible for a high proportion of concussion incidents.
Saturday's English Premiership final between Leicester and Saracens featured a yellow card for each team for a shoulder-to-head contact, while Aussie Will Skelton became the first Barbarians player shown a red card - for a dangerous tackle - in Sunday's game against an England XV.
"Rugby is a game that bring immense benefits to those who play, benefits which far outweigh the risks," said World Rugby chief executive Alan Gilpin.
"However, we know that any collision sport such as ours will result in injury and it is incumbent upon us to provide our players with the best advice we can, and that is exactly what we're doing with these individualised rehabilitation protocols."
Reuters/Newshub