Aaron Eckhart and Richard Jenkins are set to join The Rum Diary, the adaptation of the Hunter S. Thompson novel that stars Johnny Depp.

According to The Hollywood Reporter, Eckhart is in negotiations while Jenkins is signed on for the movie, which Bruce Robinson adapted and is directing. Amber Heard also is on board.

Eckhart is part of a love triangle that sees him vying with Depp for Heard's affection. The Rum Diary is the tale of a washed-up, hard-drinking journalist named Paul Kemp (Depp) in 1950s Puerto Rico. Eckhart would play Sanderson, a wealthy landowner who believes everything has a price and introduces Kemp to a different standard of living.

Jenkins is playing Lotterman, the man who oversees the rundown newspaper where Kemp works.

The project, which Depp, Christi Dembrowski and Graham King are producing, begins shooting March 30 in Puerto Rico.

The Rum Diary was released October 28th, 2011 and stars Johnny Depp, Aaron Eckhart, Michael Rispoli, Amber Heard, Richard Jenkins, Giovanni Ribisi, Amaury Nolasco, Marshall Bell. The film is directed by Bruce Robinson.