Bill Bray, who was bothered by a groin injury during spring training, has been placed on the disabled list with a strained left groin.
Cincinnati called up right-hander J.J. Hoover to replace the left-handed Bray on the roster and in the bullpen.
Hooper was acquired from the Braves in the Juan Francisco trade and had been serving as the closer at Triple-A. He’ll be making his MLB debut at age 24 after posting very impressive strikeout numbers in the minors.
Bray was a key part of the Reds’ bullpen last season, but injuries have repeatedly sidetracked his career and the 29-year-old southpaw hasn’t thrown 50 innings in a season since he was a rookie in 2006.