Tom Taylor and Colin Slade were called in as cover for Beauden Barrett, who sustained a calf injury in Saturday's 47-29 win over the Wallabies, and his fellow fly-half Aaron Cruden, who is nursing a sore knee.
Loose forwards Luke Whitelock and Brad Shields come into the squad as cover for Luke Romano and Liam Messam, the latter a late withdrawal from the side for the Sydney test who will miss Saturday's return match with a hamstring injury.
Lock Romano will undergo a scan to determine the extent of the groin injury he sustained in the Sydney test.
Title-holders New Zealand have already lost talismanic fly-half Dan Carter for up to a month with a calf injury.
Victory over Australia in Wellington on Saturday would see the All Blacks retain the Bledisloe Cup, the symbol of trans-Tasman Sea supremacy, for an 11th straight year.