He stressed the firm was working on a treatment, not a vaccine.

It expects to launch clinical trials in the UK this summer, Mr Loncarevic said.

The world tennis number one returned to the Serbian capital Belgrade on Monday after he was deported from Australia following the decision of Immigration Minister Alex Hawke to cancel his visa.

The cancellation of his visa on public interest grounds was upheld by Australian judges.

His visa was revoked last Friday after Mr Hawke said his presence in Australia posed a public health risk.

He argued Djokovic's presence risked aggravating anti-vaccination sentiment and causing civil unrest.

The country's sports minister has said there will be no exemption from its new vaccine pass laws.

Tennis Australia has denied claims it footed the legal bill for Novak Djokovic during his unsuccessful bid to stay in Australia. Pictured is Tennis Australia boss Craig Tiley (left) with the world Number One (right)

Novak Djokovic was deported because the Australian immigration minister was reasonable to label him as an anti-vaxxer, court papers have revealed.

The world No.1 was kicked out of Australia on the eve of the first Grand Slam of the season on Sunday.

The Government's lawyer labelled Djokovic as "an icon for antivax groups".

Chief justice James Allsop on Thursday delivered the court's reasons for rejecting Djokovic ’ s challenge to his visa cancellation.

Novak Djokovic (pictured with wife Jelena) could sue over alleged 'ill treatment' in Australia

"there was no issue that mr djokovic was not, by january 2022, vaccinated.

"it was plainly open to the minister to infer that mr djokovic had chosen not to be vaccinated because he was opposed to vaccination or did not wish to be vaccinated."

AHWC Immigration Law principal lawyer Maggie Taaffe warned earlier this month Djokovic could sue if he was deported.

Hawke exercised a personal power to re-cancel Djokovic's visa sparking the federal court case, which upheld the cancellation and resulted in his deportation the evening before the start of the Australian Open on Monday.

Novak Djokovic left Australia on Sunday after losing his appeal in Federal Court (Image: Getty)

Djokovic's lawyers disputed claims the tennis star was an anti-vaxxer, arguing that was based on one statement in April 2020 "well before Covid vaccines were available" and that Hawke had failed to ask the tennis player his views.

To win, Djokovic would have had to have shown the minister could not have been satisfied “ logically or rationally on the available material ”.

Djokovic had admitted to attending events after testing positive to Covid-19 on 16 December, including knowingly attending a media interview and photoshoot on 18 December after he had been notified of the results.

On Thursday, The Sun reported that Djokovic was considering suing the Australian government over his detention, arguing it amounted to ill-treatment.

Novak Djokovic (pictured) is reportedly weighing up his legal options after be deported from Australia

Djokovic's mother claims he was "subjected to torture, to harassment", an apparent reference to the conditions at the Park hotel in Melbourne where he was kept with refugees and asylum seekers, who had reported finding maggots in their food in December.

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