The Wild also assigned defenseman Mike Reilly to their AHL affiliate Tuesday and placed center Jordan Schroeder on waivers. Fontaine has an unspecified upper-body injury and can be activated at any time.
With Nate Prosser also around for depth on defense, the Wild decided to send Reilly to Iowa so he could play regularly. The 22-year-old played for the University of Minnesota the past two seasons.
The Wild start their season Thursday at Colorado. Their home opener is Saturday against St. Louis.