Lee was scratched from the lineup ahead of Thursday's Grapefruit League game against Boston due to lower-back tightness, Betsy Helfand of the St. Paul Pioneer Press reports.
Lee has been given the day-to-day label by the team, so there's no reason to believe his injury is anything serious. He'll take a day to recover Thursday; meanwhile, Jose Miranda will pick up some extra reps at the hot corner before the start of the season.