Japan are set to welcome back defender Marcus Tulio Tanaka from injury for Wednesday’s friendly against Finland in Tokyo.
Japan are concerned about the size and strength enjoyed by the Socceroos and the return of the Urawa star has helped to ease those worries.
"There's absolutely no problem with the knee," Tulio told Japanese media.
"I need to get a game under my belt so I want to play the full 90 minutes against Finland."
Australia are on top of Group One with nine points from three games while Japan have two points less.