Cate Blanchett has warned fans to "prepare themselves" for the "tricky" new Bob Dylan bio-pic.

Blanchett is one of six actors who portray the legendary singer-songwriter in Todd Haynes' new film 'I'm Not There', and she says that, like Dylan, it's anything but straight forward.

She tells the Mail, "It's a very fractured rendition of a persona. Prepare yourself, it's tricky."

The film, which also stars Richard Gere and Heath Ledger, premieres at the Venice Film Festival later this week.