Double-A Columbus placed Southisene on the 7-day injured list July 29 with a wrist injury.
Gaurav Vedak of Baseball Prospectus reports that Southisene was hit on the hand/wrist area on a pitch in his first game after getting promoted to Double-A on Tuesday. The 19-year-old shortstop slashed .255/.379/.428 with four home runs and nine steals in 38 games at High-A prior to the promotion.