The move was necessitated by the unavailability of Martin Maldonado, who is on the bereavement list. A 40-man spot was opened by moving J.C. Ramirez to the 60-day DL, which was going to happen at some point anyway since he is down for the rest of the year.
Graterol, 29, has seen limited MLB action over the past two years. He has produced a .214/.218/.276 slash in 102 plate appearances at the game’s highest level. In parts of five seasons at Triple-A, he carries a marginal .286/.313/.346 batting line.