Joaquin Phoenix has teased a 'Joker' sequel.

The 46-year-old star won the Best Actor Oscar for his role as Arthur Fleck/Joker in the 2019 movie, which serves as an origin story to the iconic 'Batman' villain and hinted that there was more to "explore" with the character.

Joaquin told Playlist: "This is an interesting guy. There are some things we could do with this guy and could (explore) further. But as to whether we actually will? I don't know."

It was reported earlier this year that director Todd Phillips was working on a script for the sequel – and he previously suggested that a follow-up had been discussed during filming for the first flick.

Speaking after the movie's release, the filmmaker said: "Well there was (a push for a sequel) even before 'Joker' came out.

"A movie does that kind of business and became that beloved around the world - they had talked to us about it. Joaquin and I had spoken about it anyway as far back as when we were shooting the movie."

Todd had planned to get DC and Warner Bros. to focus on movies that explore the darker side of their superheroes and hoped that other filmmakers would embrace the concept.

The 50-year-old director explained: "I pitched it as three movies, Joker being the first with me, and then these two other movies, with two other directors.

"But I don't really want to name them, because then it'll become a thing and I'm pulling these directors into it when I've never even told them about it. It was just me telling Warner Bros. about it."