Djokovic, who became the focus of intense media attention surrounding his chance to play in Melbourne Park, holds 80% of the shares in a Danish biotech firm. One of the firms main aims is to develop a treatment for COVID-19.
QuantiBioRes announced that Djokovic acquired a majority of their shares in June 2020. They are currently in the process of developing a peptide that is designed to inhibit the coronavirus from infecting humans.
A spokesperson for the tennis star did not immediately respond when asked for comment.
Djokovic has had a stellar career. At the moment, he is in a three-way tie with fellow tennis greats Roger Federer and Rafael Nadal for the most Grand Slam title wins. He was hoping to win his 21st at this years Australian Open but that was not to be as he was deported before the tournament started.
His unvaccinated status is likely to cause more grief from the tennis star as both the French Open and the US Open have announced their strict vaccination rules.
France, which will host Mays French Open has announced via its sports ministry that there will no exemptions from their vaccine pass law.