Fifita will be assessed as the week progresses, as will Israel Dagg who is nursing an on-going knee complaint. Dagg failed a concussion test against the Pumas but is believed to have emerged from that unscathed. If Dagg's knee does not recover Nehe Milner-Skudder may take his place, with Rieko Ioane expected to return to the left wing.
"It was quite a starting debut wasn't it so he's a bit sore," Foster said of Fifita. "We'll get a better handle on it tomorrow."
Despite Fifita's headline performance - Sam Whitelock suggesting he'd have sore hamstrings if he could run that fast - Squire is expected to be preferred at blindside as the All Blacks revert to their strongest available side for the Boks.
On that basis, Sam Cane and Ardie Savea will also switch to their traditional roles in this team.
Collectively, the All Blacks loose forwards and pack need to tidy up their work at the breakdown after the Pumas exposed them there. Too often at Yarrow Stadium the Pumas were more urgent in getting over the ball. Once in place the likes of Pumas captain Agustin Creevy are incredibly difficult to move.
By targeting the breakdown the Pumas found success slowing and disrupting the All Blacks ball, making life challenging for TJ Perenara from the base.
Just as the Boks are expected to target Damian McKenzie at the back after his struggles under the high ball so, too, will their loose forwards look to follow Argentina's lead and play spoilers at the breakdown.
"We knew they had a lot of good jacklers in their team. That's something we need to fix this week," Savea noted. "South Africa have similar guys in their team so we've got to make sure we sort that out so we can play some footy."
So much of the All Blacks' game revolves around pace. Aaron Smith's return at halfback should help in this regard but the more the Boks limit the speed of the All Blacks ruck ball, the better chance their defence has of pressuring Beauden Barrett who is having issues combating collective line-speed and individual shooters at present.