Tatum, Fiennes and Tilda for Caesar
Channing Tatum, Ralph Fiennes and Tilda Swinton are the latest stars said to be in talks for the Coen brothers' new comedy.
Hail Caesar! will be set in the 1950s and star George Clooney as Hollywood "fixer" Eddie Mannix.
According to the Hollywood Reporter, Channing would play a "Gene Kelly-type" star, while Ralph is in line for the part of Laurence Lorenz, a studio director, and Tilda is eyeing the role of a powerful Hollywood gossip columnist.
Tilda has worked with the Coens before on comedy Burn After Reading, although this would be the first Coen film for Channing and Ralph.
Josh Brolin - who worked with Joel and Ethan Coen on No Country For Old Men and True Grit - was previously confirmed to have joined the cast, although his role is yet to be revealed.
The film will mark the fourth collaboration between George and the Coen brothers following O Brother, Where Art Thou? Intolerable Cruelty and Burn After Reading.
George's character is employed by film studios to protect Hollywood stars' squeaky clean images by carrying out damage control to hide any dirty secrets.
It is not known if the character is based on the real-life Eddie Mannix, who worked for MGM studios. His wife had an affair with the actor George Reeves, and Reeves was found with a gunshot wound to the head which was ruled as suicide, but questions have always surrounded his death.
Joel and Ethan Coen have written the screenplay and will direct and produce the movie.