Polanco was optioned to Triple-A Rochester on Monday, Rhett Bollinger of MLB.com reports.
The Twins were in need of a roster spot following the activation of Eduardo Escobar off the disabled list, and Polanco proved to be the odd man out despite logging three doubles and a home run in limited playing time with the parent club. He'll likely get more playing time with the Triple-A squad, but it wouldn't be surprising to see the 22-year-old back up with Minnesota later in the season considering his solid hitting and defensive versatility across the infield.