The Red Sox will be without one of their biggest workhorse relievers for much of the home stretch.

The club announced Friday that left-hander Brennan Bernardino has been placed on the 15-day injured list with a left lat strain and that fellow lefty Chris Murphy has been recalled from Triple-A to take his place on the roster.

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The move is retroactive to Sept. 10, meaning Bernardino could be eligible to return in time for the team’s final regular season series against the Detroit Tigers.

Bernardino has been a mainstay of the Red Sox bullpen over the past three seasons and currently ranks tied for fourth on the team with 55 appearances in 2025. Bernardino has posted a 3.14 ERA over a career-high 51.2 innings, and he remains among the club’s most used relievers despite having spent three weeks in Triple-A from late July into mid August.

Since returning to the big league club on Aug. 19 Bernardino has posted a 3.38 ERA over his last eight appearances.

Murphy was recently optioned to Triple-A Worcester to clear space on the roster for Kyle Harrison, but his stay in Worcester proved brief. The 27-year-old lefty has appeared in 17 MLB games for the Red Sox, posting a 2.81 ERA over 25.2 innings while holding opposing batters to a .157 average.