Fisher was released by the Twins on Saturday, Brandon Warne of Access Twins reports.
The Twins reassigned Fisher to minor-league camp Wednesday.
Fisher signed a minor-league contract with the Twins on Thursday, Darren Wolfson of Channel 5 Saint Paul reports.
Fisher was outrighted to Triple-A Nashville on Monday.
The Brewers designated Fisher for assignment Tuesday, Tom Haudricourt of the Milwaukee Journal Sentinel reports.
Fisher (hamstring) was reinstated from the 10-day injured list Thursday.
Fisher (hamstring) was sent to Triple-A Nashville on Friday to resume his rehab assignment.
Fisher (hamstring) had his rehab assignment paused by a calf injury Tuesday, Adam McCalvy of MLB.com reports.
Fisher's (hamstring) rehab assignment was paused Tuesday, Adam McCalvy of MLB.com reports.
Fisher (hamstring) is expected to begin a rehab assignment at Triple-A Nashville on Tuesday, Will Sammon of The Athletic reports.