The new rules come into place from July 1, with the World Rugby also agreeing to updated assessment criteria that take a player's history of concussions into account.
The vast majority of elite-level rugby union players diagnosed with a concussion will not be able to return to play for 12 days as a result of changes being introduced by the sport's world governing body from July 1.
The current regulations allow players who fail a head-injury assessment during a game to be back on the field seven days later if they follow return-to-play protocols. The updated criteria being used to judge how quickly players can return after showing obvious concussion symptoms now includes their history of concussions.
They will also affect upcoming Wallaroos fixtures, with Australia due to take on New Zealand in two tests in August."It is going to be a new mindset for coaches and players," said World Rugby's chief medical officer Dr Éanna Falvey.