New York, Sep 23 - Hollywood superstar Brad Pitt has had discussions with the producers of 'Sherlock Holmes' to star in a sequel as the detective's nemesis Moriarty, according to people familiar with the project.

Nothing concrete is in place for Pitt as of now as there are still three months to go until the first picture is released on Christmas Day, reports aceshowbiz.com.

Robert Downey, Jr. plays Holmes in the Warner Brothers project, which has been directed by Guy Ritchie. Jude Law plays Watson, and Rachel McAdams stars as Irene Adler. Much of the talent is expected to return in the new picture, as could Ritchie as the director.

Pitt has been the subject of a litany of blog rumours as appearing in several shots of 'Holmes' as Moriarty, but those familiar with the script say the character is in shadow and cannot be recognised.