Mark Ruffalo has revealed the actresses he would cast as She-Hulk.

The Avengers star - who plays Bruce Banner/the Hulk - said that Zoe Saldana would be his first choice to play his on-screen cousin Jennifer Walters.

"Well I think Zoe Saldana would be a great She-Hulk," he said during a Reddit AMA. "It'd be nice to see someone like her join the Avengers.

"Or someone quiet and demure like Emma Stone would be nice. But it would be up to the powers that be."

Both actresses have prior experience in Marvel Comics movie adaptations.

Saldana will play Gamora - another green-skinned superhero - in Marvel Studios' Guardians of the Galaxy, which will be released next month.

Stone starred as Gwen Stacy in Marc Webb's two Amazing Spider-Man films at 20th Century Fox.

Ruffalo recently revealed that Marvel is considering a new Hulk solo movie.

Joss Whedon's sequel Avengers: Age of Ultron will be released in the UK on April 24, 2015 and in the US on May 1.