Leonardo DiCaprio, who is signed up as one of the film's producers, has also expressed an interest in taking the starring role.
Tor Jonasson from Sweden's Salomonsson agency, which represents Nesbø, said that the contract had already been signed.
"We have signed the contract for the book Blood on the Snow coming next year, a book Nesbø writes under a pseudonym," he told the Aftenposten newspaper. "It has been sold to Warner Brothers and Leonardo DiCaprio is one of the producers. He has even expressed interest in playing the lead role."
Jonasson predicted that Nesbø would soon overtake Stieg Larsson to become the best-selling Scandinavian author in history.