Star duo David Pocock and Allan Alaalatoa have served their time on the sideline and should return if fit. But Scott Sio, Folau Faingaa, Rory Arnold and Tevita Kurdrani still have stints to sit out.
McKellar confirmed some of his Wallabies players will miss the Crusaders clash and said the changes won’t stop there.
“We’ll review and see what the options are. Changes will certainly be considered, we can’t perform like that and expect that there wouldn’t be changes,” McKellar said.
“There will be changes because of Wallabies standing down but we need to look thoroughly at performances across the board.
“It was an error-riddled performance. Just too many errors and certainly a lack of urgency and effort. It was hard to watch.
“When things don’t go well we’ve got to be better. Pressure and stress comes in professional sport and at the moment it’s an area we don’t handle well. We’ve got to improve.
“The boys are back in on Friday. In review, we need to be honest and make sure we’re demanding higher standards and accountability of each other.
“We have to stop making mistakes and stop making individual errors. We’ve got to front up with a whole lot more intent and desire and passion for the jersey because we lacked a little bit of that on Sunday.”
The Brumbies usually-reliable lineout fell to pieces in the first half which McKellar said simply wasn’t good enough, but he also admitted there were errors across the park.
“[Losing lineouts was] individuals missing calls which is obviously a communication issue,” McKellar said.
“There are absolutely no excuses there, we had a full week of training, a nine-day turnaround from the Waratahs game, so it was just individual error.
“And when you’ve got just about everyone making a mistake throughout the course of the game, you get the performance you got. It wasn’t good enough.”
Eamonn Tiernan is a sports reporter with The Canberra Times