New Zealand head coach Scott Robertson confirmed that two of the Barrett brothers, Scott and Jordie, are in doubt ahead of their clash with Scotland next Saturday.
Both of the talismanic stars were forced off early in the first half of the All Blacks victory over Ireland in Chicago on Saturday.
Second-row, and captain, Scott was removed after three minutes, while former Leinster centre Jordie left the field late in the first quarter.
"Scooter (Scott) has a laceration, a cut in the leg," coach Scott Robertson said.
"We will see how long that is going to take but it is a decent (cut) at the bottom of his knee there."
Youngest brother Jordie was removed with ankle and knee discomfort, after an awkward landing following a James Ryan tackle. He did play on for a few moments after, but was substituted at the next break in play.
"He's tough, he just wanted to keep running," Robertson said.
"He got a little bit of a hip drop. We will just see how bad once we've done a scan."
The oldest of the three, outhalf Beauden Barrett, was impressed by how the world number two-ranked side responded to losing two crucial players so early in the game.
"Obviously my bros are a bit beaten up," Beauden said afterwards.
"I was super proud and happy with how we responded. I could have let that rattle me, seeing my two bros go off.
"I was impressed with how we stayed connected and stayed aligned on what we wanted to achieve, and we came away with the right result."
Outside back Leicester Fainga'anuku proved to be a handful for the Irish defence, playing a vital role in the buildup to their first try, finished by Ardie Savea.
As for Beauden Barrett, his confidence remained undeterred, landing three of his four conversion attempts, and teeing up the game-changing third try that pushed New Zealand out of sight.
The loss of the Barretts is a big blow for Robertson's charges, as they look to end their year by completing their 'grand slam tour' for the first time since 2010.
They face Scotland on Saturday, who have never beaten the All Blacks, before taking on England and Wales.
Additional Reporting: Reuters
