The Twins activated Lewis (groin) from the 10-day injured list Friday.
The 25-year-old landed on the shelf with an adductor strain in early July, but he's ready to rejoin the Twins after a two-game rehab assignment with Triple-A St. Paul. Lewis has been dominant at the plate when available this year with 10 homers and a 1.039 OPS, but injuries have limited him to just 24 games.