The All Blacks will be without two of their key players for next weekend's second Bledisloe Cup test in Auckland.
Midfielder Ryan Crotty and wing Rieko Ioane will both miss the match after picking up injuries during the All Blacks' 31-13 victory over the Wallabies at Sydney's ANZ Stadium on Saturday night.
Crotty was "knocked out" in a head clash with fellow midfielder Jack Goodhue, while Ioane picked up a hamstring injury early in the second half.
"He's [Crotty] been knocked out so he won't play next week," Hansen said after the match. "Rieko doesn't look like he'll be ready either."
Crotty was replaced in the 12th minute by Anton Lienert-Brown, who made a massive impact off the bench.
The Chiefs player is an option to join Goodhue in the centres for the second test, but Hansen isn't ruling out starting Ngani Laumape.
"We've got a lot of faith in Anton because he's never let us down. The reason we didn't start him is we know he does that role off the bench really well, and it allowed Jack to start with a guy he knows really well.
"Alby has been given an opportunity through injury and done really well.
"Having said that, we've got some quality people who can play that position, Ngani being one of them. We'll make some decisions over the next few days."
There are a couple of options for the All Blacks to consider for the vacant wing spot. Jordie Barrett and Nehe Milner-Skudder are all options to come into the starting side, while Ben Smith can also move out to the wing.
Hansen could potentially bring someone in from outside the squad as a replacement depending on the severity of Ioane's injury.
Meanwhile the Wallabies are sweating on the fitness of star fullback Israel Folau, who departed ANZ Stadium on crutches after suffering an ankle injury.
"He's off for scans. He's got a pretty swollen ankle," said Wallabies coach Michael Cheika.
"Looked like he rolled it when he went up to catch, so we will see after he gets a scan exactly what the diagnosis is."