The Santa Monica Police Department presented the case to the DA's office.
On Wednesday, Singer said the woman's claim is "absurd" and said that Stallone has requested to file a police report alleging that the woman filed a false police report.
He acknowledged that Stallone had a relationship with the alleged victim while shooting a movie in Israel in 1987 while he was single.
"If this is the same woman, he categorically disputes this", Singer said.
California has a complex statute of limitations for criminal prosecutions of sexual abuse but offenses must generally be prosecuted within 10 years.
The second alleged incident of sexual assault involving Stallone was said to have happened in 1986 at a Las Vegas hotel.
The attorney said at the time that he planned to submit a claim against the woman for filing a false police report.
"No one was ever aware of this story until it was published today, including Mr. Stallone", spokesperson Michelle Bega told The Daily News past year. "At no time was Mr. Stallone ever contacted by any authorities or anyone else regarding this matter". Police didn't say anything about the nature of the allegation against Stallone.
Producer Harvey Weinstein was charged in NY with rape and sexual assault last month.