"Karolina broke her radius... in a fitness room at a training camp in Spain," Hrdlicka said in a statement, adding that treatment would take about four weeks.

"Unfortunately I will be out for a while and will not compete at my favourite tournaments in Australia," the 29-year-old Pliskova said on Facebook.

"Some days are worse than others... but time and belief can heal everything," added the world number four, posing for a photo with her right forearm in a bandage.

Pliskova has yet to win a Grand Slam tournament, having reached the 2016 US Open final and then lost in three sets to Ashleigh Barty in the Wimbledon final this year.

Pliskova -- whose best performance at the Australian Open was reaching the 2019 semi-finals -- has not missed a Grand Slam tournament since the 2012 US Open.