Movies
Rex Features
Stiller will replace Mark Ruffalo in the Squid & The Whale director's latest project.
Ruffalo is believed to have pulled out of the production following the death of his brother Scott on Monday.
Amy Adams, who initially signed for the film, is also rumoured to have exited the project, according to The Hollywood Reporter.
Baumbach and producer Scott Rudin are currently looking for Adams's replacement and financial backers.
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