Ornelas and the Athletics agreed on a minor-league contract Thursday, Francys Romero of Beisbol FR reports.
Ornelas opted out of his minor-league deal with the Yankees on July 16, and he has now found a new home. The 26-year-old posted a .299 average with nine home runs, 39 RBI, 41 runs scored and nine stolen bases over 75 contests with Triple-A Scranton/Wilkes-Barre, and he's expected to report to Triple-A Las Vegas on Friday after signing with the A's.