Stuttgart Open champion Laura Siegemund has sustained a right knee injury and will miss next week's French Open, Germany's Fed Cup captain has said.
Siegemund was injured during her second round match against Barbora Krejcikova at the Nuremberg Cup and her Fed Cup captain Barbara Rittner told reporters she would not play at Roland Garros.
"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)