Tokyo rugby officials announced Sunday that a day after New Zealand's Sam Cane announced that he had used up too long, judging a concussion alteration to a head injury rating and could not play again ,
World Rugby said the 10-minute window for a HIA would now begin when players reach the rating room rather than leaving the field.
All Black's flanker Cane faced South Africa in the first half, but had to cross the 72,000-capacity International Stadium Yokohama for his HIA, which meant he could not return in time despite passing the test.
With immediate effect, the official 10-minute HIA window will begin from the moment the temporarily replaced player enters the HIA room, not when the player leaves the play area, "World statement says Rugby.
"This should help slightly longer distances to the H A space from the field at some venues.
New Zealand coach Steve Hansen admitted that he was not "overly happy" about the incident with Cane and that he had asked for clarification of the rules.
"Last night Sam had to … because of an HIA the other side of the stadium, "Hansen said after Pool B's 23-1
" But we've received word that time has run out when you get to the actual room itself , I was not too happy last night that one of our best players missed 40 minutes of the game, but I'm just glad they made it. "