However, no official offer has been made yet, reported Variey.
The Joker standalone film, to be directed by Todd Phillips, is also expected to have DiCaprio's long-time collaborator and director Martin Scorsese on board as an executive producer.
The actor-director duo has teamed on films such as "Gangs of New York", "The Aviator", "The Departed", "Shutter Island" and "The Wolf of Wall Street".
The two will next work on "Devil in the White City" and "Killers of the Flower Moon".
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