Farrell cleared waivers and was outrighted to Triple-A Louisville on Saturday, C. Trent Rosecrans of The Athletic reports.
Farrell was designated for assignment by Cincinnati on Thursday and will choose to accept an outright assignment rather than testing free agency. He made 17 appearances (11 starts) at Triple-A Iowa earlier this year and posted a 5.03 ERA and 1.46 WHIP in 59 innings.