The reigning Australian Open champion will miss the Fed Cup semi-final against the Czech Republic later this month, and the Madrid WTA tournament from April 30 to May 8.
"I think this is a great pity," said Clijsters, 27, on her website.
"The Fed Cup is something I was really looking forward to. But I felt that something was out of the ordinary: There were too many minor ailments, one after the other, which did not seem to disappear.
Something like that gets into your head."
"I don't want to force anything, because I want to prevent it from becoming chronic by any means. I really want to be there at this year's Roland Garros.
"Now there is no other option than to rest and I certainly can't use a tennis racket for the first few weeks. We will continue with lots of physiotherapy and exercises to strengthen the surrounding muscles."
If all goes according to plan the four-time Grand Slam winner hopes to be fit to return for the Rome tournament on May 9, two weeks before the French Open where she was runner-up in 2001 and 2003.
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