Minnesota activated Thielbar (oblique) on Sunday off the 15-day injured list.
Thielbar fired two scoreless rehab appearances with Triple-A St. Paul, and while he wasn't activated as expected before Friday's game against the Guardians, the left-hander will now get a chance to be a mid-innings option for the Minnesota bullpen. Cole Sands (shoulder) was placed on the 15-day IL in the corresponding transaction.