Updated on June 14, 2011 at 6:02 p.m.

CHICAGO (CBS) The Cubs called up Chris Carpenter from Double-A Tennessee and activated Reed Johnson from the 15-day disabled list Tuesday. Outfielder Tyler Colvin and pitcher Casey Coleman were sent down to Triple-A Iowa to make room on the roster.

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Johnson hasn’t played since May 26 because of back spasms and went hitless in two rehab games with the Iowa Cubs.

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This is Carpenter’s first stint with the Cubs as he was added to the 40-man roster. He was drafted in the third round of the 2008 draft and has been highly thought of by the organization ever since, especially after a stellar performance in the Arizona Fall League last year.

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Unfortunately, Carpenter failed to seize a spot in the bullpen in spring training and has struggled in the minors this season. After posting a 6.41 ERA at Triple-A Iowa, he was demoted to Double-A Tennessee where he put a 4.38 ERA in 10 games.