Novak Djokovic has a majority stake in a Danish biotechnology firm attempting to develop a treatment for Covid-19, the London Independent has reported.

Djokovic is now back in Serbia after being deported from Australia on Sunday for failing to meet the country’s tough Covid immigration laws.

QuantBioRes boss Ivan Loncarevic has revealed that the tennis player’s acquisition of an 80 per cent stake was made in June 2020.

The company is developing a peptide, which inhibits the virus from infecting the human cell, and expects to launch clinical trials later this year.

The CEO told the media organisation the company had about a dozen researchers working in Denmark, Australia and Slovenia.

Djokovic and his wife Jelena own 40.8 per cent and 39.2 per cent of the company, respectively.