Billy Slater is clinging to hope his World Cup dream isn't over after suffering a recurrence of a knee injury in Australia's 62-0 quarter-final thrashing of the United States.
The Kangaroos fullback was escorted off the field early in the second half of the 12-try romp in Wrexham, Wales.
Earlier in the week, Slater was arrested and released without charge after being involved in a nightclub fight in Manchester.
The Tomahawks defied 500-1 tournament odds in reaching the last eight, but the Kangaroos did not concede a try for the third straight match.
Australia will face either Samoa or Fiji in the semi-finals.
Meanwhile Brett Morris and Jarryd Hayne scored four tries apiece to join an elite list of Australians to score four tries in a match, and becoming the seventh and eighth players to do so and the first in 13 years.
No Kangaroo had achieved the feat since Wendell Sailor, Mat Rogers and Gorden Tallis did so in 2000.
