'Hi everyone, I wanted to inform you all that I tested positive for Covid-19, ' he wrote on Instagram.
Dimitrov pulled out of the regional exhibition tournament - which had sparked criticism for lack of safety precautions - in Croatia on Saturday following his opening singles match, after feeling unwell.
"I'm really sorry for any harm I might have caused!" . "I already contacted all players of the Adria Tour, and their families, all of the volunteers, all people involved in organization - absolutely none of them have any symptoms".
The Sunday night final between Djokovic and Andrey Rublev was cancelled.
Due to the loosening of COVID-19 guidelines in Croatia, players weren't obliged to observe social distancing rules.
Goran Ivanisevic, one of Djokovic's coaches, said the news from Dimitrov was "shocking" and that "now everyone will have to be tested".
Twitter lashed out at Djokovic for his recklessness in organisation of The Adria Tour as Dimitrov's positive test is likely to disrupt plans of resumption of the ATP and WTA Tours.
"However, we are in close contact with health authorities to insure that all people who were in contact with Grigor Dimitrov will be tested tonight".
Novak Djokovic is set to be tested in Belgrade.
Now the debate over whether a mini-tour that started with a tournament in Djokovic's Serbian homeland this month should have gone ahead at a time when the world tennis tour is shut down due to the global pandemic.
"While watching images from the Adria Tour, I kind of felt that something was really wrong".
It is not yet known whether the final leg in Banja Luka, Bosnia and Herzegovina will go ahead on July 3-4.
Djokovic's agent confirmed on Monday that his client was yet to undergo a COVID-19 test but said he would receive one, according to BBC Sport.