The Change Up centers on a married man (Bateman) who switches bodies with his best friend (Reynolds).
Mann will star opposite Ryan Reynolds (Buried), Jason Bateman (The Switch) and Olivia Wilde (Tron: Legacy) in the body-swapping comedy penned by The Hangover writers Jon Lucas and Scott Moore.
Filming is expected to commence in the Autumn.
Mann will next be heard in Rio, a new 3D animated film from 20th Century Fox, set to be released in April 2011.