Affleck and Damon earned an Oscar for penning 1997's Good Will Hunting, in which they acted, as well. They also shared the screen in 1992's School Ties, 1999's Dogma and 2001's Jay and Silent Bob Strike Back.
Their next collaboration is based on Eric Jager's non-fiction book The Last Duel: A True Story of Crime, Scandal, and Trial by Combat in Medieval France, The Hollywood Reporter said.
Affleck also reunited recently with another old pal for a project.
Damon and Scott previously worked together on 2015's The Martian.