DeWitt was designated for assignment yesterday to make room for Travis Wood. Now, the Cubs are looking to fill DeWitt's role as infielder-off-the-bench with Cardenas.
Cardenas, 24, was selected by the Philadelphia Phillies in the 1st round of the 2006 MLB June Amateur Draft (37th overall). In 2008, he was traded along with Josh Outman and Matthew Spencer to the Oakland Athletics in return for Joe Blanton. He was a non-roster invite for the A's in both 2009 and 2010 Spring Training camps before being designated for assignment to make room on the 40-man for Jonny Gomes in late January.
The Cubs claimed Cardenas off waivers (and actually DFA'd DeWitt to do so) on February 6th.
Cardenas has a career minor league line of .303 / .368 /.417 across the farm systems of the Phillies, Athletics, and Cubs, and was hitting .319 / .376 / .521 in 109 plate appearances for AAA Iowa this season.