The Inception star will portray the flamboyant performer in Rocketman, a new film which will detail the singer's life after leaving rehab in 1990, and he admits the musical parts of the movie are proving difficult.

Hardy tells Britain's The Sun newspaper, "I'm not a singer I have no idea really. I'm really trying because of Rocketman but it's hard for me to open my mouth in that way. I'm not really drawn towards singing and musicals and that stuff... I did some rap when I was a kid but I'm somebody's dad now so it wouldn't be too cool to crack that out!"

More: Elton John | Elton John reveals secrets for biopic |

Daily Mail: Tom Hardy to play Elton John in new biopic Rocketman charting the ...