Rolen, 36, started Wednesday in the Reds' victory over the Pirates but had missed the previous three games. Although he started the All-Star Game for an injured Placido Polanco of the Phillies, Rolen has struggled this season, hitting .242/.279/.397 with five home runs and 36 RBI.
This is the second trip to the DL for Rolen this season because of the same injury. He was on the DL from April 24 to May 12.
The Reds called up Todd Frazier from Triple-A to take Rolen's place on the roster. Rolen, formerly the team's top prospect, can play third -- as well as shortstop and the corner outfield spots. This is Frazier's second stint with the team. He got a pinch-hit appearance on May 23 in Philadelphia.@cbssportsmlb on Twitter or subscribe to the RSS feed.