MOSCOW, Russia - Simona Halep has been forced to withdraw from the Kremlin Cup due to a back injury.

The WTA World No.1 recently announced that she was suffering from a disc hernia in her back but has dispelled rumours that she would be forced to undergo surgery on the problem.

After last playing at the China Open, where she retired after losing the first set to Ons Jabeur, she had hoped to return to action in Moscow, but that has not proven possible.

"I tried everything I could to be ready here as I really wanted to play but unfortunately the back is still causing me pain and I don't want to take any risks," she said. "While it's disappointing to withdraw, I know it's important to put my health first. I've had a few wonderful days in Moscow and wish the tournament every success."

Halep was recently confirmed as the year-end WTA World No.1 for the second year in succession, having spent 40 weeks atop the ranking in 2018.

"I feel like I've played a good level of tennis, and I was consistent...very consistent and very strong, mentally and physically," she told the media

The 27-year-old won the French Open earlier this year, her maiden Grand Slam title after losing the final in Australia in January.