Vespi was called up from Triple-A Norfolk on Monday, Nathan Ruiz of The Baltimore Sun reports.
Vespi will return to the big leagues after being sent down July 6. The left-hander owns a 5.40 ERA and 1.27 WHIP with 13 strikeouts over 13.1 innings in 12 appearances with the Orioles this season. Rico Garcia was optioned to Triple-A in a corresponding move.