Harkins didn't practice Monday after being diagnosed with a concussion, per Michelle Crechiolo of the Penguins' official site.

EDGE Analysis

Harkins, who was injured in Saturday's 2-1 loss to Winnipeg, will have to clear concussion protocol in order to return to the lineup. Consider him out indefinitely for now. Harkins has four assists and 59 hits over 34 games this season.