Beatles legend Ringo Starr has warned fans against buying an "unauthorized" book about his life because he is "not participating" in the project.

New York Post writer Michael Starr is working on a biography of the drummer, but the musician has distanced himself from the tome and warned devotees he is not involved with it.

In a statement posted on his Facebook page, Ringo writes, "There is an unauthorised biography being written by Michael Starr and I want my friends & fans to know it has nothing to do with me, I'm not participating with it at all."