"According to Australian journalist Paul Karp, the immigration minister has the right under section 133C(3) of the Migration Act to cancel Djokovic's visa again. If it happens, Djokovic would face deportation again and miss the Australian Open even if he appeals against such cancellation as the tournament organizers had said they would not wait beyond January 11 to confirm the Serb's availability to feature in the Grand Slam tournament.
Djokovic could also be barred from entering Australia for 3 years if his visa is canceled again.
However, confirming that such a step, if taken, would bar Djokovic from the country for three years, judge Kelly warned the government lawyers that "the stakes have now risen, rather than receded."
Under the said section of the immigration act, the minister, Alex Hawke should be satisfied that a ground exists to cancel the visa -- in this case the purported threat to public health because he is unvaccinated and the visa-holder “does not satisfy the minister that the ground does not exist” and that it would be in the public interest to cancel the visa."