But Fuller and Green departed after clashing with producer Fremantle, leaving Jesse Alexander to step in as showrunner.
American Gods will end after its third season on Starz.
Mr. Wednesday pulls Shadow Moon into a mystical world, where Old Gods struggle to keep their power in the face of New Gods.
According to Variety, Starz has decided not to pick up the series for another season, but there is the possibility the show will live on as an event series or TV movie.