The four-time major champion and former No.1-ranked player posted a photo of herself on a grass court and wrote on Twitter: "my Achilles still isn't right so I'll see you next time."
Her most recent match on tour came at Chicago last August. She turns 42 in two weeks. Also missing from the entry list is Leylah Fernandez, the 2021 US.
In a technical sense, this renders the event an exhibition, because there are no ranking points at stake.
Barty was the first Australian woman into the singles final of the Australian Open since Wendy Turnbull in 1980 and is now the first Australian champion since Chris O’Neil in 1978.
As of Thursday night, there still was no resolution, although Djokovic's name was at the top of the men's bracket, with his No. 1 seeding intact, due to face another Serbian, Miomir Kecmanovic.