All Blacks skipper Richie McCaw is "unlikely" to feature for the Crusaders in Saturday's Super Rugby show down with the Hurricanes.
The Crusaders flanker was concussed in his team's 14-point win over the Blues in Round 11 and will undergo tests over the coming days to determine his availability for the game against the competition leaders.
But Crusaders coach Todd Blackadder said no risks would be taken, and with the World Cup four months away, McCaw is likely to be given a week off.
"If he's not right, there's no way he will play, Richie," Blackadder told Fairfax Media.
"We will wait to see how he's feeling this week and he will to go through the correct procedures and protocols.
"That isn't to say he won't be right and he felt pretty good after the game.
"But without absolutely ruling him out, I would say it is probably unlikely. He will have to be absolutely right in passing the CogSport test."