One-time Fifty Shades Of Grey star Charlie Hunnam will replace fellow Brit Benedict Cumberbatch in the movie adaptation of David Grann's book The Lost City of Z, according to new reports.

Hunnam, who was tapped to play Christian Grey in the erotic thriller before stepping down due to scheduling issues, will step in for Cumberbatch, who had to abandon The Lost City of Z after signing on to play Marvel's Doctor Strange.

Brad Pitt is among the producers of the film, which will also feature Brits Sienna Miller and Robert Pattinson.