If finalised, the "Girl on the Train" actor will join Jesse Eisenberg, who will play Marceau in the project, according to The Hollywood Reporter.
German star Matthias Schweighofer is also in talks to star in the film directed by Jonathan Jakubowicz.
The movie follows the life of Marceau and his involvement in the French Resistance during WWII.
Bennett is vying for Emma's character, a Resistance fighter who played a vital role in inspiring Marceau to join her in rescuing thousands of children and walking them out of France and into Switzerland.
The film will be produced jointly by Claudine Jakubowicz, Carlos Garcia de Paredes and Dan Maag.