PHOENIX -- The D-backs added left-hander Jared Miller to their 40-man roster Monday in order to protect him from being exposed in next month's Rule 5 Draft.
Clubs had until 6 p.m. MT to protect Rule 5-eligible players.
Miller, who was selected by the D-backs in the 11th round of the 2014 Draft out of Vanderbilt University, had a 2.93 ERA last season in 53 relief appearances for Double-A Jackson and Triple-A Reno.
While with Reno, Miller had a 1.72 ERA and limited opponents to a .147 batting average.
Miller was converted from starter to reliever prior to the 2016 season, and it was around that time that fellow Vanderbilt alum David Price helped him develop a cut fastball, which he picked up quickly and used it to thrive in relief.
Miller, who is the D-backs' 17th-best prospect according to MILBPipeline.com, pitched in the Arizona Fall League in 2016 and was invited to Spring Training in 2017 as a non-roster player.
The D-backs' 40-man roster is now at 38.