Ferrell likely will sign on for the comedy about a down on his luck lawyer whose life improves after he innocently saves a fly from being swatted, Empire Magazine Online reported Thursday.
"Fly on the Wall" will join a roster of current Ferrell films that are either awaiting release, being filmed or are in pre-production.
The funnyman is set to next appear in "Anchorman," soccer comedy "Kicking and Screaming," Woody Allen's "Melinda and Melinda" and "Bewitched" with Nicole Kidman.
Ferrell also has been tapped for the role of "Music Shop Dude" in "Tenacious D in: The Pick of Destiny."
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