The tournament is played, just like the Australian Open, in Melbourne and is usually a perfect opportunity to hone your form before this year's first grand slam.
Australia's immigration minister, Alex Hawke, has previously said that only fully vaccinated players will be allowed to enter Australia to play.
However, an email from the Women's Tennis Association, WTA, states that even unvaccinated players can participate, as long as they isolate themselves for two weeks and take tests during their stay.
The men's world number one and reigning Australian Open champion, Novak Djokovic, has previously said that the vaccine requirements will determine whether he goes to Melbourne or not.
The Serb does not want to say whether he has been vaccinated or not.
On the women's side, Naomi Osaka is the reigning champion and her participation is also uncertain.
Osaka has competed sparingly after struggling with her mental health.
The Australian Open will be decided on January 17-30.
CLIP: Mikael Ymer joins the David Cup team (October 25)
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Elias and Mikael Ymer, Robin Söderling in the background, lead the Swedish Davis Cup team.
Photo: Bildbyrån