Holder signed a minor-league contract with the Rockies on Dec. 15.
Triple-A Scranton/Wilkes-Barre activated Holder (knee) from its 7-day injured list Thursday, Conor Foley of The Scranton Times-Tribune reports.
Holder was sent back to the Yankees and assigned to the team's alternate training site Tuesday.
Holder was traded from the Phillies to the Reds on Saturday, Jeff Passan of ESPN.com reports.
The Phillies selected Holder with the 11th pick of the Rule 5 draft.
Holder (hip/stomach) was assigned to the Yankees' alternate training site Saturday.
Holder underwent a series of tests Saturday after experiencing discomfort in his left hip and stomach area, Bryan Hoch of MLB.com reports.
Holder claimed a spot on the Yankees' 60-man player pool.
Holder was reassigned to minor-league camp Monday.
Holder (undisclosed) played in both ends of a doubleheader with Low-A Charleston on Monday.