Kim Clijsters' comeback will have to wait a bit.
The former world No. 1 sustained a knee injury while training for her 2020 return.
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Clijsters, who was aiming for a January comeback, said she's still determined to return after her knee is fully healthy.
"I’ve had to make the decision that I will not be able to compete in January," Clijsters posted on Twitter. "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."
While the Hall of Famer did not set a definitive return date, she did rule out playing in January.
In 2007, Clijsters initially retired at age 23 due to chronic injury and her desire to start a family with husband and former pro basketball player Brian Lynch. Clijster gave birth to daughter Jada in February of 2008.
In 2009, in just the third tournament of her comeback, Clijsters stunned the world winning the US Open as an unranked wild card.
The owner of 41 career WTA singles titles says her biggest concern is how will her body respond after having three kids and spending recent years without a regular training routine.
"Let's see if I can get my body in shape to play tennis at a level where I would like it to be at, that I have in mind of where I would like to get to, and see if it's possible,” Clijsters told WTA Insider Courtney Nguyen. “To see, first of all, if my body is capable of even doing that."