Blues first-five Piers Francis has returned from a wrist injury which ruled him out of his team's bonus point victory over the Bumbies and will wear the No10 jersey against the Waratahs in Sydney on Saturday.
The return of Francis, who has been selected to play for England in Argentina next month, means Bryn Gatland drops to the reserves bench.
The rest of the side remains unchanged from the line-up which scored three tries against the Brumbies in Canberra for their second away victory of the season.
Coach Tana Umaga said the clash against the Waratahs would be a major battle.
"We are very evenly matched in stats this year in most parts of the game so we are expecting a very hard encounter," he said.