Scotland resource coach Nathan Hines has praised the impact Mario Ledesma has had with Australia's scrum as they prepare for Sunday's quarter-final.
The 38-year-old, who was given the role with the Scottish side earlier this year, is looking to cause a shock against the two-time winners at Twickenham.
But he knows Scotland face a tough job against Ledesma's strong scrum and also the back-row double act that is David Pocock and Michael Hooper.
"They are very good, that is why they run with two sevens. A part of rugby is to slow ball down and get as many turnovers as you can and that is what those guys do," he said of the duo before mentioning the Wallaby scrum.
"Mario Ledesma has come in and done a lot of work with them. He's experienced and has plenty of experience in France where scrum is king. They've done a lot of work with him and it is bearing fruit."
Australia look a much stronger side this year and after their Rugby Championship triumph and unbeaten pool campaign, Hines also applauded the work done by head coach Michael Cheika.
"Cheiks is good at getting a team motivated, making a team think that he is right behind them, which his is. He's done a good job with Australia. Two years ago they wouldn't be coming into this World Cup as strong as they have," he said.
"They have a very solid line and their players defend like dogs. England and Wales couldn't find a way through it."