Mark Ruffalo is still in the dark about whether he will join his Avengers co-stars in Captain America: Civil War, but he's more than willing to show up.

The actor fuelled rumours that The Hulk could make an appearance in directors Anthony Russo and Joe Russo's 2016 movie by tweeting a title card for the movie in May.

Speaking to The Daily Beast, Ruffalo revealed that he actually has no idea if he'll be needed now that production is underway.

"I heard a rumor about that [movie] the other day," he initially teased. "I haven't seen a script, nobody's told me, and I don't have dates. But I can only hope so!"

The actor went on to say: "I was talking to Robert Downey the other day, and he said, 'Ruffalo! I heard you're coming out here', and I said, 'OK! I'll be there'."

It is known that William Hurt has agreed to reprise his role as The Hulk's notorious enemy General Thunderbolt Ross in Captain America: Civil War.



Everything we know about Captain America: Civil War, including cast, synopsis and the latest rumours

Civil War finds Avengers team members Captain America (Chris Evans) and Iron Man (Robert Downey Jr) opposing one another when the US government demands that superheroes register themselves and act as a peacekeeping force.

The split between the two heroes will divide the Black Widow (Scarlett Johansson), Hawkeye (Jeremy Renner), Vision (Paul Bettany), War Machine (Don Cheadle), Ant-Man (Paul Rudd) and the Scarlet Witch (Elizabeth Olsen).

Captain America: Civil War - which Scarlett Johansson recently described as a completely unique Marvel film - is scheduled to open on May 6, 2016.