Kazan: Australia are expecting Peru, with nothing to lose, to be at their most dangerous and are pulling out all stops to beat the entertaining South Americans, including lessons in body language on the field.

The Socceroos must beat Peru in Sochi on Tuesday (midnight Australian time) and hope France defeat Denmark to progress to the second round of the 2018 World Cup but that won't be easy against a nation eliminated from the tournament and playing only for pride.

And the Socceroos have not just focused on tactics, technique or fitness in their preparation for Los Incas, but even their on-field demeanour, with Australia looking to give nothing away when it comes to the mental battle.

Coach Bert van Marwijk has been quick to hound any player who shows negative body language in training or games, whether it be the disappointment of a misplaced pass or the agony of a spurned chance. The Dutch coach doesn't want to give opponents a sniff of against a disciplined and rugged Australian side whose tactics hinge on heaping frustration upon sides ranked significantly higher.