Djokovic has declined to comment on his vaccination status in recent months, although he was included last week on the Serbian team for the ATP Cup which starts Jan. 1 in Sydney.
The nine-time Australian Open champion is tied with Roger Federer and Rafael Nadal for the men's record of 20 Grand Slam singles titles. Nadal is also entered for the Australian Open, which starts Jan. 17, but Federer is skipping the tournament as he continues his recovery from surgery.
Daniil Medvedev, who ended Djokovic's bid for a calendar-year Grand Slam with a victory in the U.S. Open final, Alexander Zverev, Stefanos Tsitsipas and Andrey Rublev are listed above No. 6 Nadal, who is not playing for Spain at the ATP Cup.
Ash Barty tops the women's entry list and will continue her quest to end a long drought for Australian women at the tournament. No Australian woman has won the singles title since Chris O'Neil in 1978.
On Monday, Bianca Andreescu, the 2019 U.S. Open champion, said she will take a mental break from tennis and sit out the start of next season, including the Australian Open.