Al Pacino is in negotiations to star as an aging rocker in Warner Bros.' Imagine, directed by Dan Fogelman, which marks his directorial debut.

Steve Carell was previously set to star as the rocker's son, but the actor has dropped out recently due to scheduling conflicts.

The story, written by Dan Fogelman, centers on a rocker who decides to change his life after discovering a letter written to him by John Lennon -- prompting him to track down his biological son, whom he's never met.

No production date has been set.