Ryan Galloway's night ended less than four minutes into the game between the Minnesota Wild and Colorado Avalanche on Thursday night.
The linesman was struck by Martin Hanzal's attempt to keep the puck in near the blue line early in the first period.
Galloway didn't emerge for the start of the second period, and an NHL official said he was getting precautionary tests but was "OK," according to the Star Tribune's Michael Russo.
Another league official later told Russo that Galloway suffered a jaw injury and was taken to a local hospital, but the severity was unknown.
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