United States star Christian Pulisic appears in serious doubt to face the Socceroos, with coach Mauricio Pochettino stopping short of confirming the attacker's availability for the blockbuster clash.
And the US coach says his charges must match Australia's "mindset" to get a crucial three points that could determine who tops Group D.
Pulisic hasn't trained with his teammates all week, including on Thursday, as he deals with a left calf issue.
