England have selected Teimana Harrison at openside flanker in the only change made for Saturday's attempt to complete a series whitewash over Australia at Allianz Stadium.
Harrison wins his second cap after James Haskell conceded defeat in his battle to recover from the foot injury sustained in the 23-7 victory in Melbourne that established an unassailable 2-0 lead Down Under.
The rugged New Zealand-born back row has enjoyed a breakthrough season at Northampton and is preferred ahead of Jack Clifford in Sydney.
"Teimana comes into the side at seven for James Haskell whose foot hasn't quite recovered from Saturday," said Eddie Jones, who has left the bench intact.
"Teimana has trained well throughout the tour and deserves his spot. He's an excellent defender and his robustness will be important to us at the start of the game. Jack Clifford is unlucky to miss out, but will finish the game for us."
Harrison made his debut against Wales at Twickenham last month and performed well in a team that was missing players from Aviva Premiership finalists Saracens and Exeter.
The 23-year-old is a strong carrier and tackler, despite his modest size for a modern back row, and is very strong over the ball, but in Haskell he is replacing arguably the player of the series.
Jack Nowell has completed the return to play protocols for concussion so retains his place on the left wing as part of an unchanged backline.
England will seal a stunning 3-0 series whitewash if they prevail in Sydney, just three months after winning a first Grand Slam for 13 years.
"We've treated this week like a dress rehearsal for the World Cup because that what we're always building towards," Jones said.
"To win a World Cup you have to win three big games in a row - we've won two so this third game is the most important game we'll play all year. It will be a good indication of where we are as a team.
"The players have enjoyed being in Coogee this week and the attitude to training has been absolutely first class. They have been inspired by the challenge of playing better for the last game.
"We're looking forward to playing in front of a full house at Allianz Stadium on Saturday and we are confident we can finish the job off with a win."