Former England captain Martin Johnson has described the Wallabies as "utterly lethal" while previewing the Rugby World Cup.
Johnson believes that Pool A – which contains England, Australia, Wales and Fiji – is one of the most difficult in the tournament's history.
Focusing on Michael Cheika's side, Johnson spoke about Australia's ability to score tries out of nothing and the threat they posed as a result.
However he also noted that the success of their scrum, especially against England, would be essential.
“Australia can be utterly lethal when it comes to scoring tries out of situations where there’s nothing on, more so any other team in the world,” Johnson told Press Association Sport.
“They execute with their hands very, very well and suddenly they’re in. They score tries and that makes them lethal.
“People perceive they have weaknesses here and there, but they’re usually able to cover them up. They almost won a World Cup in 2003 when they couldn’t really scrummage.
“If England get ascendancy in the scrum and the referee penalises Australia, it makes a big difference to the game. If he doesn’t penalise, then it nullifies the advantage at the scrum.”