Hernandez -- who has been on the 15-day disabled list since Aug. 6 with a left ankle sprain -- tossed a rehab outing for Double-A Bowie on Monday afternoon, giving up one hit in an inning of work. He struck out all three batters he faced on Saturday, and manager Buck Showalter said prior to Monday's Orioles game that the organization felt Hernandez was "real close."
Viola struggled at Triple-A Norfolk, recording an 0-2 record and a 17.65 ERA in 8 2/3 innings before going down to Bowie. The lefty went 3-4 with a 3.59 ERA, including 19 walks and 64 strikeouts in 62 2/3 innings with the Baysox. He matched his season high with six innings on Monday in Bowie's season-finale loss to Richmond.
Both Hernandez and Viola are on the team's 40-man roster, although this will be Viola's first trip to the big leagues. The pair will add depth to a 'pen that has been surging since back-end guys Jim Johnson, Michael Gonzalez and Koji Uehara returned.
Viola is the second pitcher to be recalled under the expanded roster, with the Orioles adding starter Chris Tillman and a trio of position players: Nolan Reimold, Roberto Andino and Brandon Snyder.