The filmmaker is a longtime fan of the tragic comedy legend and admits he's close to pre-production on the film of Belushi's life.
He tells Details magazine he has yet to cast the film - but his The Hangover star Galifianakis is a favourite to play the wildman.
Phillips admits he's surprised by Internet stories suggesting Seth Rogen will play Belushi: "They want Seth Rogen? That's interesting. I honestly never even thought of that.
"Zach, obviously. I've thought of Zach because it's Zach, and I think of him for everything."