Eric Canha-USA TODAY Sports

Before opening a three-game series against the Mariners at Fenway Park on Monday night, the Red Sox made a pair of roster moves relating to their bullpen.

Boston reinstated left-handed reliever Joely Rodriguez from the 15-day injured list and officially designated veteran reliever Ryan Brasier for assignment, the club announced.

Rodriguez signed a one-year, $2 million contract with the Red Sox in November after posting a 4.47 ERA (3.23 FIP) in 55 relief appearances (50 1/3 innings) for the Mets last season. The 31-year-old southpaw was slated to be one of two left-handers in Boston’s Opening Day bullpen alongside Richard Bleier, but he suffered a Grade 2 right oblique strain towards the end of spring training and began the 2023 campaign on the injured list as a result.

In five rehab outings between Double-A Portland and Triple-A Worcester, Rodriguez allowed one earned run on four hits, one walk, and nine strikeouts over 5 1/3 innings. The Dominican-born hurler last pitched on Saturday, so he should be available for Monday’s series opener against Seattle.

By activating Rodriguez, the Red Sox now have three lefties available out of the bullpen. While Rodriguez and Bleier have been with the club since spring training, Brennan Bernardino was added to the mix after being claimed off waivers from the Mariners last month.

Brasier, meanwhile, first informed reporters on Sunday night that he had been designated for assignment. The 35-year-old had just surrendered three runs on four hits (including a two-run home run to Nolan Arenado) over a career-high 2 1/3 innings in the Sox’ 9-1 loss to the Cardinals.

Coming off of that outing, Brasier saw his ERA on the season rise to 7.29 ERA in 20 appearances (21 innings) for Boston. Though a 4.39 FIP suggests that Brasier was the victim of some bad luck, the Red Sox clearly felt it was time to move on and go in a new direction.

“Obviously, no hard feelings,” Brasier said late Sunday night. “Like I said, I know it’s a business. And things happen. But hopefully get picked up in a day or two and try to go win somewhere else.”

Brasier had been the third-longest tenured member of the Red Sox behind only Chris Sale and Rafael Devers. Boston now has the next seven days to either trade, release, or waive Brasier, who is still owed roughly $1.5 million of his $2 million salary for the 2023 season.

Following this series of transactions, the Red Sox now have 39 players on their 40-man roster. More moves will be coming soon, as Kutter Crawford (left hamstring strain) is expected to be activated from the injured list as soon as he is eligible to on Friday.

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