Correctional Services said that “matters are under control” at Johannesburg’s Sun City Prison on Wed.
SYLVESTER Stallone, the 63-year-old actor, is set to reprise his role as Vietnam veteran John Rambo for the fifth time next year in a film that will see his character battling drug and people traffickers on the US-Mexico border.
Rambo, which was released in 2008, had initially been billed as the final instalment in the series.
A source said: "The character obviously fascinates Sylvester and he feels there's more life in him yet.
"This time Rambo will be taking on drug lords and human traffickers after the kidnap of a young girl. Like all the previous films it's bound to be very violent but the character always had big box-office appeal."
Although the actor - who first played John Rambo in 1982's First Blood - is keen to begin production on the movie, he first faces a battle to get in shape.
The source added: "Sylvester had to push himself to get in shape for the last film, and it doesn't get any easier as he gets older." - Bang