That makes Phoenix the latest talented actor to play the Dark Knight's arch-nemesis, who was introduced in 1940 and is one of the first supervillains.
Nearly a month to the day since the Jim Gordon actor told TooFab at the 7th Australian Academy of Cinema and Television Arts International Awards that he'd "like to see someone like Joaquin Phoenix play" Batman next, it turns out the actor is in talks to join the Batman cinematic universe.
The film will explore the character's time in Gotham as he becomes a supervillain.
If the whispers are anything to go by 43-year-old actor Joaquin Phoenix will be taking on the role of the disturbed Batman villain
A release date for the Joker movie has not been announced.
But now you can consider us slightly more on board with Phillips' Joker idea given who is in talks to take on the role of the Clown Prince of Crime.
It's instead to be a prequel, a Joker origin story that will supposedly be a gritty '80s crime film. Two different film Jokers is only a small step beyond that, and Phoenix would no doubt provide his own unique but twisted interpretation to go into a pantheon that already includes showstopping performances by Jack Nicholson and Heath Ledger. For his work as an actor, Phoenix has received a Grammy Award, a Golden Globe Award, and has three Academy Award and British Academy Film Award nominations.
This would be Phoenix's third flirtation with a major superhero hero - he was rumored to have been courted to play Marvel Studios' Doctor Strange years ago, and THR says he turned down the role of Lex Luthor in Batman v Superman: Dawn of Justice.