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Guerrero last pitched on Wednesday which is likely when the injury occurred. No word yet on the severity of the strain or on when he may be available to pitch in the postseason. Wyatt Olds was recalled from Triple-A Worcester in a corresponding move to take his place in the Red Sox’ bullpen on Sunday.

The hard-throwing right-hander had been sidelined since the start of September due to right shoulder inflammation. The Red Sox will want to get him into at least a couple of games over the next week just to make sure that he shakes any rust off before the start of the postseason. Wyatt Olds was optioned to Triple-A Worcester in a corresponding move on Sunday.

Guerrero allowed three runs in one-third of an inning last night while pitching for the third time in four days. He’s been a key piece of Boston’s pen, so hopefully, a little break here will get him right for the final 7-10 days and the postseason.

What a find Guerrero has been for Boston. In his first MLB action since 2019, he has a 2.45 ERA and a 23/2 K/BB in 18 1/3 innings since being called up in late May. The walk rate is simply astounding. Guerrero has always had a great arm, but he couldn’t establish himself in the majors previously because of control issues. He improved there during his time in Japan, but even so, he still walked nine percent of the batters he faced for Chiba Lotte last year. Right now, he’s at three percent. Guerrero is 35, but if he keeps throwing strikes, he could well help the Red Sox beyond 2026.

What a great story and moment for Guerrero. The 35-year-old has not pitched in an MLB game since 2019 as a member of the Miami Marlins. After that, he missed a season during the COVID year, played in the minors in the White Sox organization, went to Japan, got another chance in the Reds organization, went to play in Mexico, got a chance in the Angels organization, went back to Japan, and then got a minor league deal with the Red Sox this winter. In 19 2/3 innings at Triple-A this season, Guerrero has a 0.92 ERA, 0.97 WHIP, and a 22/6 K/BB ratio while touching triple digits on the radar gun.

No word yet on the corresponding move(s) that the Red Sox will make to the roster. Guerrero, 35, holds a scintillating 0.92 ERA, 0.97 WHIP and a 22/6 K/BB ratio across 19 2/3 innings in 15 appearances at Triple-A Worcester this season. He’ll bolster the club’s middle relief corps.

The 35-year-old hurler hasn’t pitched in the big leagues since the 2019 season. He spent the 2025 campaign toeing the slab for the Chiba Lotte Marines of Japan’s Nippon Professional Baseball where he registered a 3.60 ERA, 1.32 WHIP and a 46/23 K/BB K/BB ratio across 50 frames. He’ll add bullpen depth for the Red Sox.