BELGRADE,  (Reuters) – Novak Djokovic, the men’s world number one 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 organised nights out in Belgrade for the players and pictures and videos of him dancing with the other participants at his event were posted on social media.

“Everything we did in the past month, we did with a pure heart and sincere intentions,” said Djokovic, who is also the head of the players council of the men’s ATP Tour.

“We are extremely disappointed to have to cancel the events in Banja Luka and Sarajevo,” said Novak’s brother Djordje Djokovic, the director of the Adria Tour.