Novak Djokovic, the men's world No 1 tennis player, has tested positive for Covid-19, the Serbian said in a statement on Tuesday.
Croatia's Borna Coric, Grigor Dimitrov of Bulgaria and Viktor Troicki have previously tested positive after playing in Djokovic's Adria Tour exhibition tournament in the Balkan region.
Djokovic revealed that he and his wife, Jelena, had both tested positive for Covid-19 after taking a test immediately after returning to Belgrade from Zadar where the final of the tournament was cancelled following Dimitrov's positive test.
In the statement, Djokovic said: "We organized the tournament at the moment when the virus has weakened, believing that the conditions for hosting the Tour had been met. Unfortunately, this virus is still present, and it is a new reality that we are still learning to cope and live with."