Australia coach Bert van Marwijk has challenged his players to have the guts to believe they can cause a massive World Cup shock.
Van Marwijk's reputation as a tournament specialist was tarnished at Euro 2012, when his Dutch side failed to win a game.
Cahill, Australia's most prolific international scorer with 50 goals, left the domestic A-League in January to join Millwall.
Ange Postecoglou quit on Wednesday as Socceroos coach a week after Australia beat Honduras to qualify for 2018 World Cup.
An emotional Postecoglou said he will not take Australia to the World Cup next year after a lengthy qualification campaign.