Arroyo is expected to become a utility infielder following Boston's signing of Trevor Story on Sunday, Ian Browne of MLB.com reports.
Arroyo had been projected as the starter at second base up until Sunday's news broke. The 26-year-old also indicated he's willing to take outfield reps to help himself get on the field, per Christopher Smith of The Springfield Republican, though it's unclear if the Red Sox plan to play him in the outfield. The signing also appears to lock in Enrique Hernandez in center field. Arroyo has experience at all four infield positions.