The Blues have lost in-form blindside flanker Steven Luatua for their critical Super 15 clash with the Brumbies on Saturday.
Luatua, who attended the All Blacks training camp this week, is suffering from a neck injury and has been replaced by Brendon O'Connor for the match at Eden Park.
Luatua, along with captain Ali Williams, is the only forward who has started each of the 11 matches the Blues have played this season.
Young tighthead prop Angus Ta'avao is also troubled by some damage after the side's last torrid match with the Crusaders and has been bracketed with rookie squad member Sam Prattley.
There is one change in the backline with another national training camp trialist, Francis Saili, starting ahead of Jackson Willison in what must have been another of the close weekly selection decisions.