The Chiefs will be without star midfielder Anton Lienert-Brown when they take on the Hurricanes in Hamilton on Sunday.
The All Blacks back will be sidelined with concussion after reporting symptoms during training this week, then later failing a head injury assessment.
"He said he can't remember where it happened and he was fine after the game [against the Crusaders]," says coach Warren Gatland.
"He came in on Tuesday and just had a bit of a headache so we gave him a test.
"No pressure from us. We're just making sure he takes some precautions… give him a rest this week and there's a bye week next week."
The 25-year-old will be sorely missed by the battling Chiefs, who desperately need a win to keep their Super Rugby Aotearoa season alive against the equally desperate and winless Hurricanes.
Flanker Mitch Karpik has also failed a head injury assessment and will play no part in this weekend's game.
Lienert-Brown's absence means stand-out rooke Quinn Tupaea shifts into second five-eighth with Tumua Manu moving into the starting side at centre.
Etene Nani-Seturo comes in to take Sean Wainui's spot on the left wing.
The forward pack remains unchanged from the one that lost to the Crusaders
In the reserves, Te Toiroa Tahuriorangi will back up Brad Weber, while lock Tupou Vaa'i and loose forward Dylan Nel return to claim a seat on the bench.
The forward pack remains unchanged from the one that was edged by the Crusaders 18-13 in Christchurch last weekend.
Gatland believes his side is just a few minor tweaks away from hitting it straps, but they need to do that immediately.
"We feel like we're not too far away," he notes. "We showed character getting back into the game against the Crusaders.
"It's a big game for us this weekend because we know were up against it 0-3 and we've got to get back into this competition.
"We've had a couple of losses in injury time, so it would be nice to hopefully not get there but to turn the tables."
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