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The world number one has tested positive along with fellow tennis players Grigor Dimitrov, Borna Coric and Viktor Troicki after they all took part in the Adria Tour tennis tournament that he helped put together.
The exhibition matches began in Belgrade and then moved to Zadar in Croatia but further events have been cancelled due to the series of positive tests, which includes Djokovic's wife Jelena.
4,000 fans were in attendance for the event, no social distancing rules were in place and the players embraced at the net before being seen playing basketball and dancing side-by-side in a nightclub.
Djokovic, who will now self-isolate with his other half after returning to Belgrade and testing positive for COVID-19, has apologised for the event going ahead and the subsequent infecting of others and urged anyone who attended to get tested right away.
Australian tennis player Nick Kyrgios has called out Djokovic and says his actions are much more irresponsible than anything he's ever been criticised for in recent years.
Andy Murray, a regular opponent of Djokovic's, believes the tournament going ahead was "not a good look".
As per Metro, Murray said: "I have always had a good relationship with Novak. In hindsight with what's happened there it is not a good look.
"When you are going through a time like this it's important any of the top athletes around the world should be showing that we are taking this extremely seriously and knowing that we are using social distancing measures and whatever it is.
"Like when I'm getting treatment from my physio wearing masks and things just to reduce the risk as much as possible. I think it has been the case a little bit in golf as well there has been a few players flouting the rules and it's just not a good look for the sport when something like this happens."
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