Infielder Jonathan Rodriguez has been placed on the disabled list backdated to July 15.
Outfielder Nick Longmire has been placed on the disabled list backdated to July 14.
Infielder Luis Mateo has been transferred from the Palm Beach disabled list to the Quad Cities active roster.
Outfielder Mike O'Neill has been promoted to Quad Cities from Batavia.
Rodriguez, 21, has an undisclosed injury first suffered in batting practice on Monday. The Quad City Times noted that Rodriguez had taken BP on Wednesday and was expected to return to the lineup Thursday. He did, but played in that one game only before going onto the DL.
This month, the right-handed hitter has a .324/.479/.676/1.155 including three home runs, six RBI and a pair of stolen bases. On the season, Rodriguez is batting .246 with an .851 OPS. He has 12 home runs and 39 RBI in 252 at-bats over 77 games.
The 22-year-old Longmire was also said to be nursing a minor leg injury but was expected to return to Midwest League action Friday night, the Times reported on Thursday. Instead, he was placed on the DL.
The Cardinals' fifth-round pick in the 2010 draft began very slowly in his first season at Quad Cities. Through the end of May, he was batting just .196, but since then has compiled an even .300 average.
O'Neill seemed ready for a bigger stage after starring for Batavia in 2010. He was fifth in the New York-Penn League with a .452 on-base percentage in his return to the Muckdogs in 2011. Frankly, at 23 years of age, the left-handed hitter needs to be pushed ahead. In 25 games with Batavia this season, O'Neill batted .290.
Brian Walton can be reached via email at email@example.com. Also catch his Cardinals commentary daily at The Cardinal Nation blog. Look for his weekly minor league column on Thursdays at FOXSportsMidwest.com. Follow Brian on Twitter.
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