The Yankees optioned Warren to Triple-A Scranton/Wilkes-Barre on Thursday, Greg Joyce of the New York Post reports.
Warren turned in a solid spot start in Wednesday's 10-2 win over the White Sox, taking a no-decision while allowing two runs over five frames. He'll rejoin the Scranton/Wilkes-Barre rotation and would likely be the first hurler called upon when/if the Yankees need another starter.