McKellen played the evil scientist in X-Men, X2 and plans to reprise the role in X-Men 3, but the new movie focuses on the early years of the villain, so the 66-year-old believes it's unlikely he'll be chosen for the pa rt.
He explains: "I have heard of a story being developed. A Magneto spin-off would probably be about his early life and therefore might not need my participation. We'll see."