Ireland coach Eddie O'Sullivan has made four changes to the side that defeated South Africa at the weekend, for tomorrow's visit of the Wallabies.
Geordan Murphy replaces Girvan Dempsey at full-back, Denis Hickie is in on the wing for hamstring injury victim Andrew Trimble, Isaac Boss replaces Peter Stringer at scrum-half, and there's a first-start for prop Bryan Young, as he comes in for Marcus Horan.
Boss is delighted to be given a first-team opportunity and said he couldn't wait for the wait for the game
Captain, Brian O'Driscoll said the changes show the strength in depth of Irish Rugby.
But he reckoned Australia would prove a sterner test than the Springboks.
"I've said for years that Australia are an incredibly smart Rugby team," he said.
"They learn very quickly how to break you down. All that said you have to turn them over. We've beaten very few times, as well as South Africa. So again, it'll come down big performances individually and collectively."