Price described Pena as a "little banged up." He last caught on Wednesday vs. the Padres and did not play on Friday vs. the Brewers.
"Pena is a useable piece today. It's nothing extreme," Price said. "It just made more sense to have the guy that's closer to 100 percent behind the plate."
Pena appeared in Saturday's game as a pinch-hitter in the eighth inning of the 1-0 loss and flied out to left field.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. Manny Randhawa is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.