The Orioles optioned Gibson to Triple-A Norfolk on Wednesday.
The move comes one day after Gibson was hammered for eight runs over 2.2 innings in a loss to the White Sox. He will return to Norfolk, where he has logged a 3.55 ERA and 38:19 K:BB over 38 innings covering nine starts this season. Gibson's spot in the Orioles' rotation will be absorbed by Dean Kremer, who is back from the injured list and will start Wednesday's game.