Hendriks (elbow) walked one and struck out one over a scoreless inning for Triple-A Worcester on Wednesday.
The organization appears to be setting up Hendriks for late-inning work once he's ready for activation. His first three rehab outings came in the fifth and sixth innings, while Wednesday's was in the eighth for the WooSox. He'll pitch again Friday and is trending toward a return in the first or second week of September.