Diamondbacks catcher Oscar Hernandez, who began a minor-league rehab assignment on Tuesday, is expected to join the Major League roster when he is ready to be activated from the disabled list, according to FoxSports Arizona.
Hernandez, on the DL with a broken bone in his hand, was a Rule 5 pick by the Diamondbacks this offseason. The Diamondbacks would need to keep him on the active roster to avoid losing him back to the Rays.
Hernandez has not seen any big-league action this season, after undergoing surgery to repair the bone at the beginning of spring training. He has one hit in eight at-bats through his first three rehab games with Class A Kane County.