Kevin Feige revealed that a movie would not go into production until after Avengers 2.
"Do I think Hulk can carry a movie and be as entertaining as he was in Avengers? I do believe that," he told MTV News. "I do believe he absolutely could.
"We certainly are not even going to attempt that until Avengers 2. So there's a lot of time to think about it."
Fans have been speculating on the likelihood of an adaptation of Greg Pak's 'Planet Hulk' storyline, following Marvel's increased focus on its cosmic properties.
"I don't think there's a lot that we couldn't do someday, as the cinematic universe continues to grow and expand and get as big as the comic book universe," said Feige. "'Planet Hulk' is a cool story. 'World War Hulk' is a cool story."
He praised the "pathos and humour" that Mark Ruffalo brought to the character in Avengers.
Ruffalo has said that he does not think Marvel knows what to do with the Hulk.
Watch a clip of the Hulk in Avengers below: