"Novak you are not alone. You have lots of supporters, we love you, we want to see you succeed," Choopani said in a message of support for the world tennis number one.
Djokovic is being held at the immigration detention hotel after he was denied entry into Australia amid a dispute over a COVID-19 vaccine medical exemption he received.
The Serbian was granted the exemption following a review by two independent medical panels prior to boarding his flight, but upon landing in Melbourne for this month's Australian Open, he was denied entry.
He has consistently refused to disclose his vaccination status while publicly criticizing vaccine mandates.
Around 100 people, including anti-vaxxers, Serbian fans of Djokovic and refugee activists, protested outside the Park Hotel on Friday (January 7).
Speaking from his room located a floor below Djokovic's Choopani, who was first detained nine years ago when he was 15, said seeing supporters outside the hotel had lifted his spirits and hoped they would for the 20-time Grand Slam champion, too.
"I feel really sorry for him, because I don't wish Australian detention for nobody," Choopani said, adding that the conditions in the hotel were "getting worse."
Australia's Border Force did not immediately respond to questions about conditions in the hotel.