As the row escalated, officials said two other players who entered the country under the same exemption granted to Djokovic were under investigation.
The Australian government pushed back on Friday against suggestions by Serbian supporters, including Djokovic's family, that the star player was effectively a prisoner, stressing he is free to leave the country at any time. The 34-year-old has not revealed the grounds for the exemption and has consistently refused to disclose his vaccination status, while publicly criticising mandatory vaccines.