Kim Clijsters' tennis comeback in January has been pushed back as she recovers from a knee injury, the four-times grand slam champion said on Monday.
Clijsters, 36, last played on the WTA tour in 2012 and had announced in September that she was planning to make a comeback when the new season begins in January.
"I've had to make the decision that I will not be able to compete in January. I am undergoing rehab and treatment for a knee injury," Clijsters said on Twitter.
"It's a setback but I'm determined as ever to get back to the game I love."
Clijsters' decision to make a comeback will mark her second return to the sport after first retiring in 2007 to start a family.
I’ve had to make the decision that I will not be able to compete in January. I am undergoing rehab and treatment for a knee injury. It’s a setback but I’m determined as ever to get back to the game I love. I really appreciate all your support and encouragement.— Kim Clijsters (@Clijsterskim) November 4, 2019
With 41 singles titles to her name, Clijsters hung up her racket after the 2012 US Open and later worked as a tennis commentator.
The Belgian won four Grand Slam titles, three US Opens and an Australian Open, before initially giving up tennis in 2012.