England coach Eddie Jones has kept a settled line-up as they name their team to face the Wallabies at the SCG on July 16.
Ollie Chessum comes in in the second row, with Maro Itoje ruled out after leaving the second Test early with a concussion.
He is joined in the starting side by Lewis Ludlam, with Sam Underhill returning to England after his latest head knock.
Ludlam came off the bench in the opening two Tests, holding off the returning Jack Willis after he was a late withdrawal due to a rib injury.
“We’ve had a squad of 36 this tour who have competed hard and we’re really proud of their efforts," Jones said in a statement.
“We go into this Test with a strong squad of 23. It’s a young, inexperienced but together group who have developed well throughout this series.
“We want to play with purpose and energy to win the series and an historic Test match at the Sydney Cricket Ground.”
Jones has made a lone change to the starting backline as Danny Care returns to the starting side, pushing Jack van Poortvliet to the bench.
Saracens lock Nick Isiekwe comes onto the bench as part of the reserves, last featuring for England in their Six Nations defeat to France in March.
He is joined by apprentice duo Will Joseph and Henry Arundell, with Joseph retaining his spot after he was a late call-up for the second Test.
The English will play their first game at the SCG since 1975, looking to claim the inaugural Ella-Mobbs Cup in front of a sold out crowd.
ENGLAND (1-15): Ellis Genge, Jamie George, Will Stuart, Ollie Chessum, Jonny Hill, Courtney Lawes (c), Lewis Ludlam, Billy Vunipola, Danny Care, Marcus Smith, Joe Cokanasiga, Owen Farrell, Guy Porter, Jack Nowell, Freddie Steward
Reserves: Luke Cowan-Dicke, Mako Vunipola, Joe Heyes, Nick Isiekwe, Jack Willis, Jack van Poortvliet, Will Joseph, Henry Arundell
