Steelers GM Kevin Colbert referred to ILB Sean Spence's 2012 ACL and LCL tear along with a dislocated kneecap as an "unknown injury."
The 86th pick in last year's draft, there is some question about whether Spence will play football again. "He's not recovered yet and, quite honestly, we have to keep our fingers crossed," Colbert said. "We just hold out hope Sean can have a successful recovery and be a Steeler." They can't count on him for 2013.