The Yankees designated Cornielle for assignment Tuesday, Gary Phillips of the New York Daily News reports.
The move clears a spot on the 40-man roster for the return of Giancarlo Stanton (calves). Cornielle gave up two runs over one inning in his major-league debut last week, and he held a 3.10 ERA and 74:41 K:BB over 72.2 frames this season during his time with Triple-A Scranton/Wilkes-Barre.