Sir Ben Kingsley has revealed he is working with Marvel on a top secret project.

The Ender's Game star refused to disclose details about the role, and would not reveal if he would be reprising his part as the Mandarin, which he played in Iron Man 3.

"It's a secret Marvel project. I'm not allowed to say any more, you're going to have to wait and see," he said.

Sir Ben, who plays military leader Mazer Rackham in Gavin Hood's big-screen adaptation of Orson Scott Card's sci-fi book Ender's Game, alongside Harrison Ford and Asa Butterfield, said he enjoyed reuniting with the Marvel crew.

"I was with many members of the crew that were involved in Iron Man 3. It was lovely to see them again. It was great to be with this wonderful family," he continued.

"I think they have enormous taste as creative artists. There's nothing lazy or gratuitous about their work. They are at the top of their game, and they're great company to keep," he added.

Marvel producer Kevin Feige admitted he could say nothing about Ben's project, joking he would feel the repercussions from the studio's bosses.

:: Ender's Game opens in cinemas on October 25.