Novak Djokovic returns a shot during a match in London. File
Ivan Loncarevic, who described himself as an entrepreneur, said the investment was made in June 2020 but declined to say how much it was.
QuantBioRes has around 11 researchers working in Denmark, Australia and Slovenia, according to Loncarevic, who stressed they were working on a treatment, not a vaccine.
The company is developing a peptide, which inhibits the coronavirus from infecting the human cell, expects to launch clinical trials in Britain this summer, he added.
A spokesperson for Djokovic did not immediately respond to a request for comment.
The tennis number one has stoked global debate about the rights of people who opt not to get vaccinated after he was deported from Australia on Sunday night, ruling him out of the Australian Open.
India, which has reported the highest number of COVID-19 cases in the world after the United States, has so far vaccinated more than 12 million health and front-line workers.
Member states are struggling to contain a third wave of the epidemic and kick-start vaccine programmes slowed by a shortfall in deliveries, and Britain has warned the bloc against resorting "vaccine nationalism."
Following an EU summit, French President Emmanuel Macron said there was a "new type of world war," adding: "We are looking in particular at Russian and Chinese attacks and attempts to gain influence through the vaccine."
The announcement comes as the Ministry of Health and Prevention on Sunday expanded coronavirus vaccine eligibility in line with the UAE's proactive policy to ensure the health and safety of all community members.
Pep Guardiola's side were teetering on the brink of blowing the title after falling 2-0 behind midway through the second half at the Etihad Stadium.
Fatima Al Housani bagged the gold in the discus throw and a bronze in the 11.84-meter long jump competition, while Latifa Al Kaabi won the triple jump gold and a silver in the 5.34m long jump competition.
The 3x3 Basketball Championship, organized by the Sharjah Women's Sports Foundation, concluded on Saturday with the participation of 10 amateur teams.