A Rule 5 Draft pick from the Rays organization, Hernandez is competing for one of the two catching spots.
"We hope it's nothing, just a bruise, but you never know. You have to check it out," D-backs manager Chip Hale said.
• In other injury news, shortstop Chris Owings (shoulder) will hit off Brad Ziegler (knee) in batting practice Wednesday. If that goes well, Owings will start at shortstop in a "B" game Thursday against the Reds.
Right-hander Daniel Hudson (two Tommy John surgeries) bounced back nicely after his first outing of the spring and threw his normal between-starts bullpen session Tuesday.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.