"She won't be able to play in Paris," said Rittner, who suggested the 29-year-old had suffered ligament damage.
Former U.S. Open men's champion Juan Martin Del Potro is also a doubt for the French Open due to injuries.
"I feel pain in the shoulder and back," Del Potro told reporters after losing in the second round of the Lyon Open.
"I will go to Paris and I will take a decision soon about whether I play the French Open."
(Reporting by Aditi Prakash in Bengaluru)
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