The 22-year-old said she had not been offered the role but would entertain the idea if she found it to be an interesting story, reported Sun Online.
Watson is aware the books are quite raunchy but is yet to read them.
"The thing is I haven't read any of the book because I haven't read a script so it's quite difficult to know what I'm turning down potentially but I hear it's quite raunchy.
"I mean if there's interesting character development and there's an interesting story then I would consider it - but I haven't been offered anything," she said.
