Ma'a Nonu will shift in a spot for Williams and if the dripfed medical bulletins are accurate about Conrad Smith, he will be cleared to return at centre after his eye surgery.
If that happens, Smith and Nonu will start their 36th test together in midfield after first running out in test tandem for the first time in 2008 when the All Blacks hosted Ireland at the Cake Tin.
So will those Wellingtonians be joined by another?
Savea's younger brother, Ardie, sped into the spotlight for Wellington in weekend ITM Cup action when his display showed why he is such a highly rated loose forward.
There is a growing thought his older brother, Julian, will return to the left wing for his first All Black appearance on his home track. His test work halted 2 months ago when he was part of a modest All Black output which squeaked past Ireland 22-19 in Christchurch.
Several players were ejected after that match. Savea, Zac Guildford, Adam Thomson and Brodie Retallick lost out while changes were needed for the injured Daniel Carter and Kieran Read.
In the interim, Savea played out the Super 15 series and then held his place as one of three three wings in the reduced All Black squad numbers with Corey Jane and Gear.
So far Savea, Conrad Smith, Thomson, and Charlie Faumuina are the only members of the 28-man squad who have yet to take the field in the Rugby Championship.
Juan Martin Hernandez returns to the No10 jumper for Argentina in the team named yesterday.
Hernandez missed Argentina's 16-16 draw with South Africa in Mendoza on August 25 with a groin injury but has recovered to replace Nicolas Sanchez. The other change to the Pumas sees openside flanker Juan Manuel Leguizamon return in place of Alvaro Galindo.
The Pumas will name their reserves tomorrow and the All Blacks will announce their playing 22 on the same day.