Wallner is out of the lineup for Monday's game against the Guardians.
Wallner will hit the bench along with fellow left-handed hitters Trevor Larnach and Edouard Julien while the Guardians send southpaw Matthew Boyd to the hill. Willi Castro and Manuel Margot will serve as the Twins' starters in left and right field, respectively, while Ryan Jeffers gets a day off from catching and serves as Minnesota's designated hitter.