In a corresponding move, Yankees right-hander Jonathan Loaisiga was transferred to the 60-day injured list.
The A's designated Morales for assignment on Monday after two months with the team. The 35-year-old posted a .204/.310/.259 slash line with one home run during his time in Oakland.
Morales will join a beleaguered Yankees squad, with Miguel Andujar, Giancarlo Stanton, Aaron Judge, and Troy Tulowitzki on the injured list, among others.
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