Harry Potter star Daniel Radcliffe said if J.K. Rowling wrote another wizard novel he would shy away from appearing in the movie, Sky News reported Wednesday.

Rowling, who has sold 450 million copies of the Potter books, recently told Oprah Winfrey she could not rule out penning another novel -- which was a surprise for the star of the film series.

"Oh God! She promised me categorically that there wouldn't be another book involving Harry," said Radcliffe, who has been playing the wizard since he was 11.

Asked whether he wanted to be a part of any future film, the 21-year-old said it was "very doubtful," adding, "I think 10 years is a long time to spend with one character."

In a break with tradition, the final installment of the novel series, "Harry Potter And The Deathly Hallows," will be released in two parts. The first is out in the UK and US on Nov. 19, while the second opens next July.

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