Deputy Foreign Minister of the Balkan state Nemanja Starovich demanded to improve the content of Djokovic, who is awaiting a decision by the Federal District Court in a migration isolation ward in Melbourne, RIA Novosti reported.
Starovich called the attitude towards the best tennis player in the world inappropriate.
Recall that Djokovic on January 5 tried to enter Australia on a visa that does not allow a medical exception from vaccination.
On January 10, the court must make its decision.
The 20-time Grand Slam champion may be banned from entering Australia for three years.
The Australian Open, the first Grand Slam tournament in 2022, will take place from 17 to 30 January in Melbourne.
Earlier, the President of Serbia called the possible deportation of Djokovic from Australia political harassment.