Hendriks (elbow) will make a third rehab appearance Sunday at Double-A Portland, MLB.com reports.
Hendriks opened his rehab assignment a week ago at Triple-A Worcester with an impressive 1-2-3 outing on 12 pitches (10 strikes) , then had less successful results four days later at Portland (one-third of an inning, one walk, one hit). The report estimates Hendriks could make between six to eight relief appearances while on assignment before being activated.