The move made room for second baseman Darwin Barney, who came off the disabled list after missing time with a sprained left knee.
Barney, who was placed on the DL after injuring his knee when sliding head first into home on June 13 against the Milwaukee Brewers, entered Wednesday batting .294 with a home run and 27 RBIs.
Barney has been wearing a brace on his knee during his rehab stint with Triple-A Iowa and is expected to keep using it upon his return to the big leagues. While Barney says the brace doesn't impede his ability to play, he says he knows it's there.
ESPNChicago.com's Sahadev Sharma contributed to this report.