Tennis' world number one was stopped at the airport in Melbourne, and denied entry to Australia for play in the grand slam tournament Australian Open.
Djokovic, who claimed he had the right to play in the tournament without being fully vaccinated against covid-19, is currently in a quarantine hotel in Melbourne.
The 34-year-old's visa has been revoked - and on Monday he may be forced to leave Australia.
It has caused emotions to flare up in the Serb's homeland.
"Something that is not fair is the political witch hunt (against Djokovic), by everyone including the Australian Prime Minister who pretends that the rules apply to everyone," Serbian President Aleksandar Vucic told Serbian media.
In the capital Belgrade, Novak Djokovic's father Srdjan led a demonstration that gathered about a hundred people outside the country's parliament.
- We do not want violence - just support, Srdjan shouted in a megaphone to the audience.
"Novak will also be crucified"
Serbian flags as well as homemade signs were visible in the sea of people.
One had the message: "They are afraid of the best, soup corona fascism".
Earlier on Thursday, father Srdjan compared his son to Jesus.
- Jesus was crucified and had to endure many things, but he still lives with us.
Novak is also crucified ... he is the best athlete and man in the world.
He will persevere, said Srdjan.
Oral protest
The Serbian Foreign Ministry also announced that a verbal protest had been communicated to the Australian Ambassador, regarding "inappropriate treatment" of Djokovic.
"Djokovic is not a criminal, terrorist or illegal immigrant, but he is treated like that by Australian authorities, which quite understandably upsets his supporters and residents of Serbia," reads a statement from the Foreign Ministry.
According to reports, the Serbian authorities will ask the Australian authorities to allow Djokovic, pending a decision on the matter, to live in the house in Melbourne that he has rented.
However, not everyone in Belgrade was upset about the Novak Djokovic case.
"They (Australia) do not let anyone into their country who comes from another continent with mud on their shoes, let alone someone who is not vaccinated against a contagious disease," a Belgrade resident told AFP.