Details of this new case have not been released yet.
"It is under review by our sex crime task force".
The case was presented by the Santa Monica Police Department.
Martin Singer, Stallone's attorney, said in December that a woman had "filed a police report alleging a rape that occurred 27 years ago".
Stallone's case joins a slew of others that are being handled by the L.A. County sex crimes task force, which was formed past year in the wake of the huge fallout from the Harvey Weinstein scandal. The statue of limitations were said to have already expired on that case, though.
United States prosecutors have launched a probe to determine whether film star Sylvester Stallone should be charged in connection with a sexual assault reported past year, a spokesman said Wednesday.More news: Navarro voices regret for harsh words about Canadian leader
More news: Spain coach Julen Lopetegui fired two days before World Cup debut
More news: Manchester City to start title defence at Arsenal
"That never ever happened", the Rocky star told Radar.
"This is a ridiculous, categorically false story", a spokeswoman for Stallone said in a statement at the time.
A complaint was made in November but the alleged act dates back to the '90s.
"We are looking into it and will gather information and whatever we discover will be passed to the district attorney".
Singer in December told USA media when the allegation first surfaced that his client "categorically disputes the claim and it is apparent that the woman filed the report to get a media outlet to publish the story".