Project is on track to begin shooting next month with McCarthy starring and co-directing with spouse Ben Falcone. McCarthy and Falcone are also producing from a script they co-wrote.
Pic follows a women who, after losing her job and learning that her husband has been unfaithful, hits the road with her profane, hard-drinking grandmother (Sarandon).
Janney would play the mother of McCarthy’s character.
Janney’s reps and the producers are attempting to work out scheduling for the thesp, who’s in Castle Rock’s untitled Hugh Grant romantic comedy and has a recurring role on Showtime’s “Masters of Sex.” She’ll be seen in Fox Searchlight’s “The Way Way Back,” due out in July.
Janney is repped by Gersh and Thruline.