Johnson signed a two-year, two-way contract with the Wild on Monday.
Johnson didn't receive a qualifying offer from the Blackhawks on Tuesday, Scott Powers of The Athletic reports.
The Blackhawks reassigned Johnson to AHL Rockford on Saturday.
The Blackhawks recalled Johnson from AHL Rockford on Wednesday.
Johnson was reassigned to AHL Rockford on Sunday, Scott Powers of The Athletic reports.
Johnson was reassigned to AHL Rockford to Thursday, Scott Powers of The Athletic reports.