The upcoming comedy stars Vince Vaughn as a middle-aged man whose life is turned upside down by the revelation that he has fathered over 500 children through sperm donation.
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Parks and Recreation star Pratt would play a single father and lawyer who assists Vaughn, according to The Hollywood Reporter.
Pratt recently appeared in The Five-Year Engagement with Emily Blunt and Jason Segel, and will next be seen alongside Joel Edgerton in Kathryn Bigelow's upcoming Zero Dark Thirty.
Writer-director Ken Scott has adapted the script from his own 2011 French comedy of the same name.
Watch a trailer for The Five-Year Engagement below:
