Juan Martin del Potro doubt for French Open battling back and shoulder injuries

Juan Martin del Potro is still unsure whether he will be able to play in the French Open, which gets underway in Paris on Sunday.

The former US Open champion said he was struggling with shoulder and back problems after his defeat by Portugal's Gastao Elias at the Lyon Open on Wednesday.

"I feel pain in the shoulder and back," Del Potro said. "I will go to Paris and I will take a decision soon about whether I play the French Open."

Del Potro has been unable to play at Roland Garros since reaching the quarter-finals in 2012 because of a lengthy battle with wrist problems.

Germany's Laura Siegemund has announced she will miss the tournament with a knee injury.

Siegemund, ranked 35 in the world, recently won the Stuttgart Open but was hurt during her second-round clash with Barbora Krejcikova in Nuremburg.

"She won't be able to play in Paris," said Germany's Fed Cup captain Barbara Rittner, who hinted the 29-year-old had suffered ligament damage.

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