Weiss signed a minor-league contract with the Cardinals on Thursday.
The Twins activated Weiss (shoulder) from the 60-day injured list Wednesday and outrighted him to Triple-A St. Paul, Dan Hayes of The Athletic reports.
Weiss (shoulder) has been sent to the Twins' Florida Complex League affiliate to begin a rehab assignment.
Weiss (shoulder) still has not progressed to pitching on a mound, the Minneapolis Star Tribune reports.
The Twins transferred Weiss (shoulder) to the 60-day injured list Tuesday.
The Twins placed Weiss (shoulder) on the 15-day injured list Thursday.
Weiss (shoulder) will begin the season on the injured list, Betsy Helfand of the St. Paul Pioneer Press reports.
Weiss is currently sidelined with a tres major strain in his right shoulder, the Minneapolis Star Tribune reports.
The Twins claimed Weiss off waivers from the Red Sox on Wednesday, Dan Hayes of The Athletic reports.
Weiss was designated for assignment by the Red Sox on Wednesday, Chris Cotillo of The Springfield Republican reports.