His wife Jelena also tested positive after attending the "philanthropic" tour in the once war-torn Balkans.
Djokovic added that he would remain in self-isolation for the following 14 days and have yet another test in five days' time.
Novak Djokovic has tested positive for Covid-19.
"We were looking forward to promoting sports and providing financial support to local players, as well as to the audience finally seeing Novak Djokovic and other tennis players live, after many years of waiting", Djokovic said. "I can't express how sorry I am for this and every case of infection". "Everything the organisers and I did the past month, we did with a pure heart and honest intentions". "Our tournament meant to unite and share a message of solidarity and compassion throughout the region".
"We were wrong and it was too soon".
Djokovic, who had already faced criticism for saying that he "personally" is opposed to taking a potential vaccine for COVID-19 in order to travel, raised eyebrows by staging the Adria Tour 2020 without any social-distancing precautions.
"Unfortunately, due to all events in the past days we decided that now the most important thing is that the epidemiological situation is stabilised and everyone recovers", said tournament director Djordje Djokovic.
"It's a little bit like when you tell your kids when they try to learn to ride the bike to wear the helmet", Gaudenzi said.
In the statement he said: "The moment we arrived in Belgrade we went to be tested".
The tournament, which also had top names such as Dominic Thiem and Alexander Zverev, was held in Belgrade and Zadar and the players were also pictured playing basketball and dancing together without following social distancing protocols. In a statement released yesterday (Tuesday) he said that the tournament met the necessary hosting conditions but the 17-time grand slam champion has apologised for the positive tests. "I hope that it will not complicate anyone's health situation".
Djokovic apologized for the infections and said his tour was created to help players from southeastern Europe gain access to competitive tennis while the ATP Tour - and other tours - were suspended due to the pandemic.