"It's just a contusion," he said after taking an X-ray. "That's about it. It's just really stiff right now, but I'm sure it will be sore tomorrow. It feels fine."
In a full count with a runner on first and one out, Padres second baseman Alberto Gonzalez hit a pitch back at Hernandez. The ball smacked off Hernandez's leg, and Gonzalez reached with an infield single.
"It just felt like it hit my funny bone," Hernandez said. "My foot just went immediately numb and tingly, and it felt kind of weird. But it feels fine, and I should be ready in a couple of days."
Hernandez said that the ball hit him right above his ankle. He walked off the diamond under his own power.
"It's just a bruise," D-backs manager Kirk Gibson said. "I was afraid to hear it, but we'll see how it feels. They'll do what they do to try and keep as much swelling down as they can. And we'll get him back on the mound as soon as we can."
Acquired in a trade with the Orioles during the offseason, Hernandez has filled the setup role for the D-backs nicely, posting a 2.65 ERA in 62 appearances.
He has recorded 11 saves on the season.