Kerr Barlow was favoured over Perenara against Wales, but the form of the Hurricanes' vice-captain since has been compelling.
"He has taken a while to bring his Super Rugby form to the test arena. I think he fell into the trap that many young guys do when the guy ahead of him is playing well ... he was trying too hard and trying to do everything," Hansen said.
Hurricanes skipper Dane Coles, selected again at hooker for the All Blacks, said of his franchise team-mate: "Coming back since June, he performed so well for the Hurricanes. He's a very competitive man, I don't think I've met anyone so competitive. I know he would have taken that [non-selection] pretty hard, but he loves proving people wrong. It's awesome seeing him get a start because he's a great player."
Another All Black being given a significant opportunity is blindside flanker Liam Squire. Squire, who normally plays No8 for the Highlanders, will make his first start for the All Blacks in the absence of Jerome Kaino and said living up to Kaino's enforcer role would not be easy.
"I've been quite lucky over the last couple of months to train alongside him each week so I've been getting tips off him," Squire said. "It makes the transition easier. I know there is going to be an expectation that I will fill the jersey like he does, so it will be a challenge."