The Dodgers selected Hernandez's contract from Triple-A Oklahoma City on Monday.
After being outrighted off the Dodgers' 40-man roster July 3, Hernandez will regain a spot a month later after Los Angeles had room available for him in the wake of Monday's trade deadline. The 30-year-old righty has made 12 appearances for the Dodgers this season, delivering an 8.15 ERA, 1.75 WHIP and 15:12 K:BB in 17.2 innings.