Callahan was sent down to AHL Grand Rapids on Monday.

The 25-year-old hasn't done much at the NHL level this season, failing to record a point while averaging 6:48 of ice time across four games. He's been proficient in the AHL, however, scoring 13 goals to go with 22 assists and 32 PIM across 53 contests, so it's clear he needs further seasoning before he'll be able to make an impact with the big club.

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