Sylvester Stallone has signed up to direct RAMBO 4 when he finishes work on ROCKY BALBOA - the sixth installment in the boxing movie series.

The 59-year-old had reportedly been considering approaching Ridley Scott or Renny Harlin to direct his fourth outing as one-man war machine JOHN RAMBO.

But, according to Moviehole.net, Stallone decided to take control of the film after he was offered an executive producer credit by the film's financiers.