The individuals they are replacing are arguably the best in the world in their positions so they will be battling not only the Pumas today but also comparisons.
TJ Perenara, Liam Squire and Patrick Tuipolotu will start this morning's test in place of Aaron Smith (rested), Jerome Kaino (injured) and Sam Whitelock (bench). That's Aaron Smith, the world's best halfback (and world's best player in the eyes of Wales coach Warren Gatland), Jerome Kaino, one of the hardest hitters and best blindside flankers in the business, and Sam Whitelock, arguably the world's pre-eminent lineout operator and 79-test veteran.
"I know there are going to be expectations to fill that jersey like he does," Squire said in response to taking over from Kaino. "It's a challenge."
It's a challenge coach Steve Hansen wants to expose the trio to, along with others among the nine changes to the matchday 23 from the side who thumped South Africa 41-13 a fortnight ago.
In the case of Kaino, a change was forced on him, but the All Blacks supremo also knows he needs to build depth. He could have opted for Elliot Dixon in the No6 jersey, given Dixon has started a test, but as he said: "We picked Squire because we have seen him play from the bench and we want to see him start a game. We have seen Dixon start and now need to see what he can do off the bench. It's all about a learning process."