Morales began the season in the Athletics' rotation, but he was demoted after two poor starts and lately has been pitching in a relief role with Las Vegas. He will provide the bullpen with some length after the A's relievers were overworked this past weekend.

After yielding five earned runs over two innings while tossing 64 pitches in Saturday's 14-6 loss to the Guardians, Morales was unlikely to be available out of the bullpen for at least the next couple of days. The Athletics will swap him off the active roster with a fresh arm in righty Tyler Ferguson, who was recalled from Las Vegas.