Aaron Cruden's World Cup hopes are in doubt after he suffered a serious knee injury in the Chiefs' win over the Crusaders on Friday.
The status of the All Black fly-half remains unclear, with an announcement expected Monday, but there are fears that he might have torn his ACL.
That would see him out for six to eight months, ruling him out of the World Cup, while a more minor injury could still leave his participation in doubt.
It would be a hammer blow to both the Chiefs and New Zealand, although the All Blacks have plenty of options in the position with Dan Carter, Beauden Barrett and Colin Slade having all featured at ten last season.
Cruden looked to be first in the pecking order though, and his absence would still have a real impact on Steve Hansen's side.