All Blacks coach Steve Hansen has benched scrum-half Aaron Smith for breaking team rules ahead of Saturday's Test with South Africa in Dunedin.
Hansen said he wouldn't compromise on discipline and made it clear that the punishment for the unspecified breach - reported to be missing a curfew after last week's win over Argentina - was not up for discussion.
"There's nothing to elaborate on," he said.
"He just broke a protocol that's non-negotiable, and the consequence is you don't start in the XV if you break it,"
The emergence of the bullet-passing Smith, has been central to the All Blacks' unbeaten run this year.
And Hansen views the Springboks as the "ultimate" test.
24-year-old Smith's replacement is 62-Test veteran Piri Weepu, who produced a stirring performance when he came on for the last quarter of last week's 21-5 win against Argentina.
"They are a big side, they are physical and we have to match that physicality and passion and desperation they have got," Hansen said of South Africa.
"They have not a had great start to the championship so if we come in half-cocked, we could find ourselves on the back foot."
Although Weepu is not as quick as Smith to clear the ball, he does offer more composure - which could be significant for fly-half Aaron Cruden, who again fills in for the injured Dan Carter.