Pittsburgh Penguins burner Carl Hagelin has been diagnosed with a concussion and is working through the league's mandated protocol, head coach Mike Sullivan announced Monday.

Hagelin suffered the injury in Saturday's 4-1 win over the St. Louis Blues. He skated on his own before Monday's practice.

Hagelin has bounced around the lineup in his first full year with the Penguins, contributing six goals and 19 points.

Pittsburgh's top-ranked offense has been stretched a little thin with top-six forwards Evgeni Malkin and Conor Sheary also out. Malkin is making progress, but apparently won't be ready for Tuesday's game versus the Calgary Flames.

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