Perez flew to Venezuela on Saturday night to join his mother, Yilda, at their home in Valencia. He was placed on baseball's bereavement list for a three-to-seven-day period.
Catcher Adam Moore was called up from Triple-A Omaha to back up George Kottaras while Perez is absent. Moore was selected over Brett Hayes, with whom he's been splitting the catching for the Storm Chasers.
"Adam Moore had a great spring for us, did a nice job, so we picked him," Yost said. "He throws well, blocks the ball good, receives the ball good and has some juice in his bat."
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.