Jenks started the seventh inning of Tuesday’s game against the Yankees, but he left after just four pitches due to back tightness.
The right-hander, who is in his first season with Boston after spending the previous six with the White Sox, also spent time on the disabled list earlier in the season with a right biceps injury.
Jenks has made 15 appearances this season and has recorded a 2-2 record with a 6.57 ERA in 12 1/3 innings.
The Red Sox recalled Luis Exposito from Triple-A Pawtucket to fill the roster spot.
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