Herrera (general soreness) has been used as a pinch hitter in three of the last four games for Triple-A Louisville.
It seems that he is healthy enough to hit, but not take the field, suggesting that the "general soreness" he is dealing with is lower-body soreness. Considering he has not been placed on the minor league DL and has been used regularly as a pinch hitter, he should return to the field in the near future. Herrera is a prime candidate to receive a September call-up, as he is generally seen as big league ready and he is on the 40-man roster. However, with Brandon Phillips still in the picture, playing time may be hard to come by for Herrera in September.