Charlie Hunnam has dropped out of the film adaptation of Fifty Shades of Grey because he does not have time to "adequately prepare" for the role.

The 33-year-old Pacific Rim star was set to play billionaire Christian Grey in Sam Taylor-Johnson's upcoming adaptation of the erotic novel but has decided he is too busy filming Sons of Anarchy to devote himself to the role.

Universal Studios issued the following statement to ''The filmmakers of Fifty Shades of Grey and Charlie Hunnam have agreed to find another male lead given Hunnam's immersive TV schedule which is not allowing him time to adequately prepare for the role of Christian Grey.''

It was previously revealed that Ryan Gosling, Robert Pattinson and Shailene Woodley turned down roles in the controversial movie.