The Reds optioned Barrero to Triple-A Louisville on Saturday and assigned him to the taxi squad, C. Trent Rosecrans of The Athletic reports.
The infield prospect has appeared in six games and gone 2-for-12 with a double since being called up Aug. 16. Barrero's roster spot was needed for the versatile Asdrubal Cabrera, who joined the Reds on Saturday after being claimed off waivers.