Edwards was optioned to Triple-A Iowa on Friday.
A three-run blowup against Kansas City on Wednesday sealed Edwards' fate, but he may be among the top candidates for a promotion during the season, if he can keep the walks in check at Iowa. Edwards posted a 2.77 ERA between Double-A and Triple-A to earn a September callup last year in his first season as a reliever, but he issued nearly seven walks per nine.