Rosario signed a minor-league contract with the Diamondbacks on Tuesday.
Rosario spent the 2019 season with Triple-A Reno, and he'll return to the organization as part of the 60-man roster for the 2020 season. He'll report to the team's alternate training site and should serve as organizational depth this year. The 33-year-old hit .250 with 11 RBI and 27 RBI over 42 games in the minors last season.