Before wrapping up their four-game series against the Angels in Anaheim on Thursday night, the Red Sox activated right-handed reliever Hansel Robles from the 15-day injured list.
In order to make room for Robles on the active roster, fellow reliever Phillips Valdez was optioned to Triple-A Worcester, the team announced.
Robles, who was initially placed on the injured list because of back spasms on May 28, returns to the Sox on the first day he was eligible to since his stint on the IL was backdated to May 25.
The 31-year-old hurler was sent out on a rehab assignment with the WooSox and was scheduled to make an appearance against the Buffalo Bisons on Tuesday. But that game got rained out and he instead threw a bullpen session at Sahlen Field before flying to Anaheim on Wednesday.
Prior to being placed on the IL, Robles had posted a 2.65 ERA and 5.20 FIP with 11 strikeouts to six walks over 16 appearances (17 innings) out of the Red Sox bullpen this season.
Valdez, meanwhile, was recalled from Worcester when Robles went on the injured list on May 28. The 30-year-old made back-to-back appearances against the Orioles that day and the next, but had not been used since.
With the Red Sox this season, Valdez has pitched to a 5.84 ERA and 3.71 FIP with 13 strikeouts to five walks over 10 relief outings spanning 12 1/3 innings of work. With the WooSox, he has allowed just one earned run across six appearances and 7 2/3 innings pitched.
(Picture of Hansel Robles: Maddie Malhotra/Boston Red Sox/Getty Images)