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The 63-year-old earlier revealed that the next Rambo movie would feature John Rambo leading a squad into a secret military base to shut down a man-beast mutant "supersoldier" project gone wrong.
The sci-fi plot was based on the novel Hunter by James Byron Higgins. Stallone owns the rights to the book and now plans to use it as source material for another film, according to an email he sent to fansite StalloneZone.
The star announced that the forthcoming Rambo update will feature the iconic hero "heading over the border to a violent city where many young women have vanished".
Stallone's next project The Expendables opens in cinemas next August.
More: Sylvester Stallone, Movies
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