The Orioles selected Banuelos' contract from Triple-A Norfolk on Sunday.
The addition of Banuelos gives Baltimore some extra insurance at catcher behind Adley Rutschman and James McCann, but the 27-year-old will likely play sparingly until the Orioles' playoff positioning is solidified. Banuelos -- who previously made his big-league debut in April before being cast off the 40-man roster -- has slashed .225/.360/.352 over 86 plate appearances with Norfolk this season.