Hagens was called up last Thursday with the D-backs' bullpen running on fumes following a doubleheader in Cleveland. The right-hander made a pair of appearances and allowed one run in 2 2/3 innings.
This will be Harris' third stint in the big leagues this year. He was on the Opening Day roster and was up for a week in June. After posting a 2.91 ERA for the D-backs in 2013, Harris has a 9.24 ERA in 12 games with Arizona.
With Reno this year, Harris was 3-2 with a 0.99 ERA.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.