King (back) will begin a rehab assignment with Double-A Springfield on Wednesday, Derrick Goold of the St. Louis Post-Dispatch reports.

EDGE Analysis

King hasn't been on a big-league mound since late July, as he dealt with an oblique strain and more recently a mid-back strain. It's not clear how many rehab appearances he'll require before being activated from the 15-day injured list, but he's nearing a return.