Ruhwedel's injury from Game 4 has been classified as a concussion, according to Penguins coach Mike Sullivan.

The bench boss said the team will evaluate the defenseman once back in Pittsburgh, at which point we'll presumably have a timeline for his return. Of course, concussions are among the trickiest injuries to handle, so this news in conjunction with Ruhwedel's lack of offensive skill makes him an easy one to avoid in playoff pools.

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