According to court records, Wade Robson is seeking permission to file a claim against the Jackson estate, saying he was abused by the pop superstar during a seven-year period. Robson stayed with Jackson at Neverland Ranch as a teen.
An attorney said Robson, 30, suffered a breakdown last year but has not stated how much his client is seeking to recoup from Jackson's estate. Details of the accusations were filed under seal.
The molestation allegations were fiercely denied by an attorney for Jackson's estate and the singer's criminal defense attorney, Thomas Mesereau Jr.
"Mr. Robson was one of my strongest witnesses in Michael Jackson's criminal trial," Mesereau said. "I called him to the stand at the beginning of the defense case, and he was adamant that he had never been improperly touched or molested. This makes no sense."
The period for filing claims against Jackson's estate has long since passed, but a California civil statute allows victims of abuse to file a lawsuit within three years of discovering "that psychological injury or illness ... was caused by the sexual abuse."
The judge overseeing Jackson's massive probate case will have to determine whether Robson's claim can go forward. Robson is scheduled to appear in court on June 6.
The Associated Press contributed to this report.