"It blew up pretty bad swelling-wise once he got inside," said manager Buck Showalter of Hernandez's ankle injury, which was suffered in the middle of a five-run seventh inning. "So that's going to be an issue."
Showalter said he had already spoken with president of baseball operations Andy MacPhail prior to meeting with the media and that the two would prepare for a worst-case scenario.
"[Head athletic trainer Richard Bancells] was hinting it's a good possibility," said Hernandez when asked what the chances were that he goes to the DL. "Just because it's my landing foot and the tendon that's sore is the tendon that takes the longest time to heal."
Hernandez entered the game following Matt Albers, who was charged with four runs and recorded just one out, and he suffered the injury hustling to cover home plate on a wild pitch.
Hernandez gingerly walked back to the mound following the play -- which allowed Bobby Abreu to score -- and assistant athletic trainer Brian Ebel came out to the hill and instructed Hernandez to take a few steps. The Orioles promptly inserted Koji Uehara, who recorded the final out of the inning.
"I didn't feel [my ankle] roll, I just felt like the ligament went over the bone," said Hernandez, who will be reevaluated on Thursday.
A former starter, Hernandez has enjoyed favorable success out of the bullpen and should the O's made a move to recall another reliever, Triple-A Norfolk's Armando Gabino.
Gabino was named the O's Pitcher of the Month, going 3-0 with a save and a 1.23 ERA in 22 innings last month. However, he is not on the 40-man roster, meaning the O's would have to remove someone and expose them to waivers first. Another less likely scenario would be to recall a position player on the 40-man to help add insurance for Josh Bell and Brian Roberts, both of whom sustained minor injuries on Wednesday.