Jordan Staal left practice today with an "upper body injury." It's believed to be his hand.
The Post-Gazette says that he's "expected to be out for awhile."
Bob McKenzie on Twitter paints a grim picture:
The Pens have not announced anything official.
We'll update the post when we know more.
EDIT: In other practice news:
"Evgeni Malkin and Kris Letang are not out on the ice for practice. Malkin left Friday's game against Philadelphia and did not play at Carolina. Letang is out with an upper-body injury. Head coach Dan Bylsma will address the injuries after practice."
EDIT 2: Jordan Staal was hit by a puck in practice and fractured his hand.
He'll need surgery and will be out for about six weeks.