Charlie Hunnam and Dakota Johnson have recently been cast as the film's leads

Ryan Gosling and Shailene Woodley reportedly turned down the chance to star in Fity Shades Of Grey.

EL James, author of the trilogy of erotic novels tracing the sexual relationship between college graduate Anastasia Steele and businessman Christian Grey, announced the film’s male and female leads on Monday (September 2). Charlie Hunnam will play Grey opposite Dakota Johnson as Steele.

According to The Hollywood Reporter, however, Gosling was “the original prototype” for the Christian Grey but had no interest in the role. Tron: Legacy star Garrett Hedlund is also said to have turned down the part because he was unable to connect with the character.

Meanwhile, Shailene Woodley reportedly declined the role of Steele because Fifty Shades‘ filming schedule could clash with her press commitments for Divergent – a sci-fi action film being pitched at the Hunger Games market that comes out next March.

Nowhere Boy‘s Sam Taylor-Wood is on board as director and Fifty Shades is expected to start shooting this November in Vancouver. The film will open in US cinemas on August 1, 2014, though the UK release date has yet to be confirmed.