Sulser was returned to the Orioles' alternate training site Thursday, Roch Kubatko of MASNSports.com reports.
Sulser was called up as the 27th man for Thursday's doubleheader against Seattle. He appeared in the second game of the twin bill and allowed one hit and no walks while striking out two in one scoreless inning. Despite having tossed three scoreless innings in two relief appearances this year, he'll continue to work at the team's alternate camp.