Right-handed starting pitcher Chris Carpenter has been placed on the 15-day disabled list.
Right-handed reliever Brad Thompson was optioned to Triple-A Memphis.
Right-handed pitchers Mitchell Boggs and Chris Perez were recalled from Memphis.
Carpenter was removed from Tuesday night's game prior to the bottom of the fourth inning with a strain to his left rib cage. While there is no firm prognosis, it is reasonable to expect the 33-year-old to miss six weeks, potentially putting him back in action around June 1. More will be known about Carpenter's condition after he is examined in St. Louis by team physicians.
Able to start and relieve, Thompson was called upon to pitch the ninth and tenth innings in Tuesday's disappointing 7-6, 10-inning defeat and took the loss. On the season, the 27-year-old has a 0-1 record with a 6.85 ERA. Thompson struck out two and walked two in 6 2/3 innings. Opposing hitters batted .345 against him this season.
Sent to Memphis to open the season, Perez has pitched four innings over three games. He has a win and two saves on no hits and three walks. Perez fanned four Triple-A batters. It remains to be seen whether or not Perez is used as the team's closer initially. Veteran Ryan Franklin may play the role short-term or rookie Jason Motte could be eased back into the job.
Boggs was scheduled to start tonight for Memphis, so was the freshest starter available. He may work in long relief for St. Louis, though the club will need a fifth starter beginning with Carpenter's next turn on Sunday in Chicago. In his only Triple-A start this season, the 25-year-old allowed one earned run in six innings.
Both Perez and Boggs made their Major League debuts with the 2008 Cardinals.
Update (3:00 p.m.): Al Hrabosky of FOX Sports Midwest reports the Cardinals will make another roster move on Friday. That individual, P.J. Walters, will be the starting pitcher that day against the Cubs in Chicago. Starters Kyle Lohse and Todd Wellemeyer will slide one day later than originally planned to Saturday and Sunday, respectively.
Brian Walton can be reached via email at firstname.lastname@example.org. Catch his Cardinals commentary daily at his blog, The Cardinal Nation.
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