Carpenter irritated by nerves By QMI Agency

St. Louis Cardinals starting pitcher Chris Carpenter reacts after hitting Texas Rangers' Adrian Beltre with a pitch during the third inning in Game 7 of the 2011 World Series. (REUTERS/Ray Stubblebine)

St. Louis Cardinals pitcher Chris Carpenter has been diagnosed with nerve irritation, causing weakness in his right shoulder.

It is not related to a cervical disc injury Carpenter suffered earlier in spring training, the Cards said Friday.

Carpenter will return to training camp next week, but there is no timetable for his return to the mound.