May 6, 2012; Cleveland, OH, USA: Texas Rangers relief pitcher Koji Uehara (19) throws a pitch in the eighth inning against the Cleveland Indians at Progressive Field. Mandatory Credit: Eric P. Mull-USPRESSWIRE
The 37-year-old right-hander has a 2.11 ERA in 21 1/3 innings so far this season, striking out 22 and walking only 2 batters.
Though it isn't thought the injury is severe, Uehara will be completely shut down for two weeks before attempting to start a throwing program.
Uehara's place on the DL will clear room for Justin Grimm, who will make his first major league start against the Houston Astros in Arlington on Saturday. Grimm, 23, has a 1.87 ERA in 13 starts for Double-A Frisco this year, striking out 67 batters in 77 innings.