Lewis (knee) will begin a rehab assignment at Triple-A St. Paul on Saturday, Betsy Helfand of the St. Paul Pioneer Press reports.
Lewis has been on the injured list since last Saturday due to a sprained left knee. The Twins haven't revealed how long they plan to keep the 26-year-old in the minors, but the fact that he's been cleared to play in games just a week after suffering the injury could point to him returning when eligible Tuesday.