Venus Williams has pulled out of the upcoming Brisbane International after suffering a "setback" in training.

The former world number one, 39, was set to join the current top-ranked player Ash Barty, Karolina Pliskova and Naomi Osaka in a strong field at the Queensland Tennis Centre from 6-12 January and the organisers said they would announce a wildcard to take her place in the draw.

"Unfortunately, I won't be starting my season in Brisbane due to an unexpected setback during my training," said Williams, a seven-times Grand Slam winner who was handed a wildcard for the event.

"I look forward to being in Australia in the New Year and will see everyone at Adelaide."

The Adelaide International begins on 13 January.