Japanese judoka Ryoko Tani has sustained a leg injury, suffering a setback in her preparations for the defense of the women's 48-kg title at the upcoming Athens Olympics, judo officials said Tuesday.

Tani damaged a ligament in her left leg when she fell after getting her toe caught between training mats during Monday's practice session in Osaka, the officials added, noting that it will take her seven to 10 days to resume full-scale training.

According to coach Tatsuya Deguchi, Tani still felt pain on Tuesday and found difficulty walking smoothly, though he said the injury is not very serious.

It is the second injury sustained by Tani in about a month. In early June, she damaged a cartilage in her right ankle and decided to sit out training in France.