"My message to him is simple and that is this is your stage," said Arnold.
"He's got to use that motivation to go out there and show everyone that's watching this game who Harry Souttar is and everyone will remember him from the World Cup.
The game is the latest in a series of high profile friendlies for the Australians, who played World Cup winners Argentina in Beijing in June and are lined up to face England at Wembley in October.
Arnold will be without Mathew Leckie after the Melbourne City forward was injured in training, ruling him out for at least six weeks.
Reporting by Michael Church in Hong Kong, Editing by Michael PerryOur Standards: The Thomson Reuters Trust Principles.
Persons:
Graham Arnold, Harry Souttar, Souttar, Enzo Maresca, Cameron Burgess, Arnold, He's, he's, Mathew Leckie, it's, Michael Church, Michael Perry
Organizations:
Socceroos, Leicester City, Premier League, January's, Leicester, Argentina, England, Wembley, Melbourne City, Thomson
Locations:
Australia, Mexico, Dallas, Qatar, Leicester, Beijing, Melbourne, Hong Kong