Guerrero (elbow) threw a 25-pitch live batting practice session Aug. 12 and could soon head out on a rehab assignment, MLB.com reports.
Guerrero is eligible to be activated from the 60-day injured list later this week, but he'll need additional time to complete a rehab assignment before making his return to the Boston bullpen. Before landing on the shelf June 28 due to a right elbow strain, Guerrero compiled a 4.15 ERA, 1.33 WHIP and 10:14 K:BB in 17.1 innings over 13 appearances.
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Red Sox's Luis Guerrero: Shifts to 60-day IL
Rotowire
The Red Sox transferred Guerrero (elbow) to the 60-day injured list Saturday.
Guerrero landed on the injured list in late June with a strained right elbow, and his move to the IL will ensure he remains on the shelf until at least Aug. 27. He'll also cede his spot on the 40-man roster to Nick Burdi (hip), who was reinstated from the 60-day injured list Saturday and optioned to Triple-A.
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Red Sox's Luis Guerrero: Expected to join big club
Rotowire
The Red Sox are expected to promote Guerrero from Triple-A Worcester on Sunday, Chris Cotillo of MassLive.com reports.
Guerrero has spent most of the season in Triple-A, where he has a 4.43 ERA, 1.24 WHIP and 16:11 K:BB across 20.1 innings. He's made four appearances out of the Red Sox's bullpen this season and has allowed one run on three hits and three walks while striking out four across 5.1 innings.
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Red Sox's Luis Guerrero: Sent back to Triple-A
Rotowire
The Red Sox optioned Guerrero to Triple-A Worcester on Sunday, Jen McCaffrey of The Athletic reports.
Guerrero was up with the big club for just one day and will be sent back to the minors after giving up an earned run on two hits and three walks over 1.1 innings in the second game of Saturday's doubleheader. Right-hander Zack Kelly was recalled from Triple-A to take Guerrero's spot in the bullpen.
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Red Sox's Luis Guerrero: Returning to majors
Rotowire
The Red Sox recalled Guerrero from Triple-A Worcester on Saturday.
Guerrero has appeared in three major-league games for the Red Sox this season and has tossed four scoreless innings while allowing one hit and striking out three batters without issuing a walk. He has a 4.91 ERA, 1.27 WHIP and 16:10 K:BB across 18.1 innings in Triple-A this season. Guerrero will take the spot in the bullpen vacated by Sean Newcomb, who was designated for assignment by the Red Sox in a corresponding move.
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Red Sox's Luis Guerrero: Dispatched to Worcester
Rotowire
The Red Sox optioned Guerrero to Triple-A Worcester on Saturday.
Since joining Boston on April 24, Guerrero has pitched four shutout innings while striking out three batters and walking none. Despite his performance, he'll end up as the roster casualty with Brennan Bernardino returning from the bereavement list.
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Red Sox's Luis Guerrero: Recalled from Triple-A
Rotowire
The Red Sox recalled Guerrero from Triple-A Worcester on Thursday.
Guerrero holds a 5.23 ERA and 7:5 K:BB over 10.1 frames this season with Worcester. He will provide manager Alex Cora with a fresh arm in the bullpen.