The British actor, who plays the head of the Jordanian secret service in Scott's upcoming Body Of Lies, revealed that the production is shrouded in such secrecy that his character goes under a different name in the screenplay.
He said: "The script is still fluid, but it's essentially the Guy of Gisborne character. In the synopsis I got, he's called Conrad, I don't know why!
"Then I got lots of missives sent through saying things like I've got to be blond. I thought, 'How do we do that?' I haven't got any hair, do I dye my stubble?"
Strong, who is currently filming Sherlock Holmes in London for Guy Ritchie, added that Gisborne is involved in a violent attack during the movie's opening scenes.
"I heard a rumour that I was going to get shot in the face by a cross bolt in the first ten pages and end up hideously disfigured through the rest of the movie," he commented. "There's so much speculation around it at the moment, but I do know that he's a bad guy."
In Scott's Nottingham, Russell Crowe will star as both the Sheriff and Robin Hood, with Sienna Miller playing Maid Marian.