Henin-Hardenne has not played since the French Open in May, having been sidelined by a viral infection.
The 22-year-old Belgian said on her website that she had made "considerable progress" in the past two weeks and had resumed full training.
Henin-Hardenne lost in the second round of the French Open and did not play at Wimbledon.
The Olympics run from August 13-29.
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