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The actress told the Daily Telegraph that she is not sure if she is right for the lead role in the film, which is set in 200 BC.
Johansson said: "I think I'm supposed to be a gladiatrix. These film guys are crazy about gladiatrixes. But do I fit into the Amazon mould? I'm a Danish/Jewish girl from New York.
"I've done weapons-training. I've fired all kinds of guns: 9mm semi-automatics, machine-guns, shotguns. I've jumped off a 60ft building.
"I learnt to ride for The Horse Whisperer. But I've never done a full-on action role."
She added that she is still waiting for her "Cirque du Soleil moment".
Johansson is also said to be in discussions with Marvel to take on the part of leather-clad Russian spy the Black Widow in Iron Man 2.
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