The Athletics announced Wednesday that Orf has elected to retire from professional baseball, Matt Kawahara of the San Francisco Chronicle reports.
Orf was scratched from Monday's lineup for Game 1 of the doubleheader against the Mariners for an undisclosed reason.
Orf's contract was selected from Oakland's alternate training site Sunday.
Orf was named to the Athletics' three-man taxi squad Thursday, Martin Gallegos of MLB.com reports.
Orf is part of the Athletics' 60-man player pool that will report to the team's summer camp, Martin Gallegos of MLB.com reports.
Orf signed a minor-league contract with an invitation to spring training with the Athletics on Monday.