To make room for him on the 40-man roster, the Reds moved right-handed starting pitcher Brandon Finnegan to the 60-day disabled list.
RELATED: Shoulder injury sends Finnegan to DL in mid-April
O’Brien was a second-round pick of the New York Yankees in 2012.
He has hit .176 in 36 major-league games after posting a slash line of .269/.317/.532 with 116 home runs in five minor-league seasons.
The Reds are his fourth pro organization.
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