Vespi was optioned to Triple-A Norfolk on Saturday.
Vespi was recalled by the Orioles in late July, and he posted a 1.29 ERA and 1.29 WHIP in seven innings over six appearances during his time on the major-league roster. He struck out 11, logged a 2-0 record and picked up a hold during his stint in the Orioles' bullpen but will head back to the minors after DL Hall was called up prior to Saturday's start.