Boston Red Sox pitcher Garrett Whitlock delivers during the seventh...

Boston Red Sox pitcher Garrett Whitlock delivers during the seventh inning of a baseball game against the Philadelphia Phillies, Thursday, May 14, 2026, in Boston. Credit: AP/Charles Krupa

BOSTON — The Boston Red Sox placed reliever Garrett Whitlock on the 15-day injured list on Thursday with left knee inflammation. The move is retroactive to May 25.

Whitlock last pitched on Sunday against the Minnesota Twins. The right-hander told reporters on Wednesday that his landing leg slipped during his first warm-up pitch of the outing, resulting in a hyperextension.

Red Sox interim manager Chad Tracy said Whitlock received a painkilling injection before Boston’s 8-0 win over Atlanta on Wednesday.

Whitlock has a 3.20 ERA through 20 relief appearances this season.

The Red Sox recalled left-hander Tyler Samaniego from Triple-A Worcester to replace Whitlock. Samaniego has posted a 1.04 ERA in 18 games for Boston this season.

SUBSCRIBE

Unlimited Digital AccessOnly 25¢for 6 months

ACT NOWSALE ENDS SOON | CANCEL ANYTIME