It's been nearly a month since it was announced that Morning Musume's Sayashi Riho was�diagnosed with sciatica, which forced her to withdraw from her activities. According to an announcement on Hello! Project's official website, Sayashi�will be making her return on August 27th for the release event of her solo photobook. Additionally, Sayashi will participate in the upcoming Morning Musume Fall 2011 Concert Tour, "Ai BELIEVE ~Takahashi Ai Graduation Special~", and their stage play, "Reborn ~Inochi no Audition~".

The idol experienced pain in her lower back after their performance in Nagoya on July 16th, and after being examined at the hospital, her condition was carefully observed by doctors to see her progress. As a result of her second examination on July 28th, Sayashi was assigned to a six-week rest for recovery.

Meanwhile, member Mitsui Aika, who fractured her left ankle, has been advised to continue resting and receive medical treatment. She will be withdrawing from Morning Musume's Fall 2011 Concert Tour, "Ai BELIEVE ~Takahashi Ai Graduation Special~", and their stage play, "Reborn ~Inochi no Audition~".

Source: Oricon and Hello! Project Official Website