The Padres recalled Cosgrove from Triple-A El Paso on Wednesday.
Cosgrove has allowed 19 earned runs over just 14.2 innings in the majors this season, but he'll return to San Diego nonetheless to give the Friars a left-handed bullpen arm while fellow southpaw Martin Perez is on paternity leave. The 28-year-old Cosgrove will almost certainly be limited to low-leverage situations while in the big leagues.