Robles was designated for assignment by the Red Sox following Tuesday's 8-4 loss to the Rays, Sean McAdam of BostonSportsJournal.com reports.
The 31-year-old surrendered a run on a hit and two walks in one inning Tuesday, and he's now been removed from the 40-man roster in order to make room for Wednesday's starting pitcher, Brayan Bello. Robles had two saves, six blown saves and seven holds in 26 appearances to go along with a 5.84 ERA, 1.58 WHIP and 21:14 K:BB across 24.2 innings.