Affleck had earlier played Batman in "Batman v Superman: Dawn of Justice", "Suicide Squad" and "Justice League".
"Excited for 'The Batman' in Summer 2021 and to see Matt Reeves' vision come to life," he tweeted along with an article about his exit from the upcoming film.
Warner Bros has officially announced that "The Batman" will release on June 25, 2021, reports variety.com.
The plot and other casting details of the 2021 version of Batman have not been revealed.