Ramirez cleared waivers and was outrighted to Triple-A Nashville on Friday, Jane Lee of MLB.com reports.
Ramirez was designated for assignment Wednesday when Boog Powell was reinstated from the 60-day disabled list. The 27-year-old generated a respectable 3.24 ERA across 8.1 innings for the Athletics this season, but he also issued nine walks, helping lead to a 1.44 WHIP. He's likely to remain with the Sounds as organizational depth for the remainder of the season.