Mittelstadt (upper body) will be activated off injured reserve and return to the lineup for Thursday's game against the Panthers, Lance Lysowski of The Buffalo News reports.

Mittelstadt has been limited to just one game this season due to an upper-body injury. The 23-year-old American, who picked up 10 goals and 22 points through 41 contests last campaign, is expected to return to a third-line role against Florida.

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