Castillo had his contract purchased from the independent Long Island Ducks on Thursday.
Castillo was hitting .308/.400/.492 with two homers across 19 games with the Ducks prior to latching on with the Yankees. The 34-year-old has appeared in just 22 big-league games over his 15-year career, and none since 2009, so don't expect him to serve as anything more than organizational catching depth with the Yankees.