Novak Đoković playing in Zadar (Photo: Dino Stanin/PIXSELL) Novak Đoković playing in Zadar (Photo: Dino Stanin/PIXSELL)

Health authorities in Croatia tested around 100 people involved with the tournament in Zadar since Sunday evening and only Borna Ćorić, two coaches, and one child were positive for the virus. Đoković declined to be tested in Croatia and returned to Belgrade. He announced on Tuesday that he and his wife were both positive, but their children were not.

"The good news is there were no new cases as of this morning. All of the individuals positive for Covid-19 have been detected and they are all doing well. Only one of them had a mild fever and none have any clinical symptoms," said Health Minister Vili Beroš.

Prime Minister Andrej Plenković has come under criticism for not self-isolating after mingling with players at the event on Saturday, although he did test negative for the virus on Monday. He is rejecting the opposition’s allegations that the country was becoming unsafe again and sees no reason to postpone the July 5 parliamentary election.

"All this spin and the theories, mostly coming from the opposition, about being unsafe are simply untrue," Plenković said on Tuesday.

Health Minister Beroš defended the Prime Minister from critics, who were quick to point out that he met with Đoković in Zadar.

"He did not spend more than 15 minutes in contact with anyone. He did not come into close contact with anyone. The people who are tasked with this problem, epidemiologists, do take into account all of the specific circumstances. I am not an epidemiologist, but as far as I understand, he was not ordered to self-isolate," Beroš said.

The Adria Tour ended abruptly on Sunday after player Grigor Dimitrov fell ill, travelled home to Monaco and reported he had tested positive. Around 100 people have been ordered to self-isolate as a result of the events in Zadar, including the city’s mayor and deputy mayor and dozens of media workers.

Đoković has come under fire from some fellow tennis players for failing to enforce social distancing rules at the events and for a night of partying in Belgrade before the tour moved on to Zadar. Australian player Nick Kyrgios called the decision to host the Tour "boneheaded" in a Tweet.