Michael Fassbender missed out on an Oscar nomination for his portrayal of a sex addict in Shame because Americans were afraid of the edgy subject matter, the film's director has claimed.

Despite gaining critical acclaim and a best actor Bafta nod for his performance in the controversial movie, Irish star Michael was left off the Academy Awards shortlist.

Steve McQueen, who also directed Michael in the 2008 film Hunger, said: "In America they're too scared of sex, that's why he wasn't nominated. If you look at the best actor list you're saying, 'Michael Fassbender is not on that list?'

"It's kind of crazy. But that's how it is, it's an American award, let them have it."

Steve lavished praise on the actor, who is currently appearing on screen alongside Keira Knightley in A Dangerous Method.

"He's a once in a generation actor. He's an actor who can transform and transcend, and you actually believe him, so that's the kind of guy he is," he said.

When asked if they'll collaborate again, Steve revealed: "It's all about the script, if Michael's the right person for the character and if he likes the script. What I like about our relationship is it's not tied, it's not a marriage, it's friendship and it's done out of respect of each other's talents and each other's love of film."

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