The Padres recalled Cosgrove from Triple-A El Paso on Wednesday.
Cosgrove will head to the big leagues for the first time since entering the professional ranks in 2017 as a 12th-round draft pick. He'll be joining the San Diego bullpen as another left-handed option after southpaw Ryan Weathers was sent to Triple-A in a corresponding move. Over his seven appearances with El Paso this season, Cosgrove struck out seven and had allowed just five baserunners in 7.1 innings.