Polanco, 29, landed on the IL on May 20 with a left hamstring strain. He is batting .284 with four homers and 14 RBI in 23 games after opening the season on the IL with a left knee injury.
The Twins optioned infielder Edouard Julien to Triple-A St. Paul in a corresponding roster move.
Julien, 24, is batting .210 with four homers and eight RBIs in 19 games with the Twins this season.
Twins reinstate Jorge Polanco from IL, demote Edouard Julien to minors