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The world No.10 announced the news on social media.

"Hi everyone, I wanted to share a quick update regarding my withdrawal from the Australian Open," Krejcikova wrote.

"Unfortunately, my back injury, which troubled me at the end of last season, is still not fully healed. It’s really disappointing because I love playing in Melbourne and have such great memories from reaching the quarter-finals last year.

"Thanks to all of you for your support. I’m working hard to get back to full health, and I can’t wait to see you on the court soon!"

Krejcikova is a two-time Major winner, having done so in 2021 at Roland Garros and at Wimbledon last year, while she has also reached the last eight in Melbourne twice.

The 29-year-old was beaten in the quarter-final by eventual champion Aryna Sabalenka at last year's Australian Open, while she finished her 2024 season as a losing semi-finalist in the WTA Finals in Riyadh.

She will be replaced in the Australian Open draw by Nuria Parrizas Diaz.

Former world No.1s Caroline Wozniacki and Karolina Pliskova have also withdrawn from the tournament, to be replaced by Yuliia Starodubtseva and Rebecca Marino respectively.