On Tuesday, the Reds claim Abel De Los Santos from the Washington Nationals and optioned him to Double-A Pensacola.
De Los Santos split 2016 between Double-A and Triple-A for the Nationals.
De Los Santos was placed on waivers by the Nationals to make room for Reynaldo Lopez on the 40-man.
In 15 games with Triple-A Syracuse, De Los Santos posted a 3.54 ERA with 26 strikeouts and 13 walks in 20.1 innings.
The move fills out the 40-man for the Reds.