On Monday, Herrera was a last-minute addition to Milwaukee's starting lineup when left fielder Khris Davis was scratched with the stomach flu.
"Just be ready," Herrera said of his role. "I have to be ready wherever they need me. I have to take fly balls, I have to take ground balls, and I guess I have to catch bullpens, too."
In fact, he caught rehabbing reliever Brandon Kintzler's bullpen session on Monday. The Dodgers signed Herrera as a catcher in 2003, but by 2006 he was already playing second base and other positions. In recent years, Herrera, a switch-hitter, has embraced a utility role because of the opportunities it creates.
He has not caught in a professional game since his days in the Dominican Republic, but came close last year at Triple-A Albuquerque, when the Isotopes' starting catcher suffered an injury. In the end, Herrera wasn't needed.
"He did real good today," manager Ron Roenicke said of Herrera's work with Kintzler. "So, he's our backup. And [backup infielder Jeff] Bianchi has also been catching bullpens. He's been going out and catching in between innings. So we do have options. …
"If suspensions come down, the catching part is going to be big. Center [field] is big, too. We don't have anybody else who can play center. [Ryan Braun] is really our backup center fielder if we don't have Gomez or Herrera here."
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. This story was not subject to the approval of Major League Baseball or its clubs.