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Mills (elbow) will begin a rehab assignment later this week or next week, Christopher Smith of MassLive.com reports.
Mills opened the season on the injured list with an elbow issue he picked up during spring training, but he is nearing the end of his recovery and is on the verge of advancing to the final step in the process. Barring any setbacks, he should be ready to pitch for the Red Sox at some point in June.
