When the Denver Broncos take on the Tennessee Titans in Week 1, they want to start fast. In order to start fast, they've got to be at full strength. Unfortunately, nobody really knows if they're going to be, because the injury status of linebacker Dre Greenlaw is very much unknown.
Greenlaw missed most of last season making his way back from an Achilles injury suffered in the Super Bowl two seasons ago. And when he did return to the field, it was short-lived. He played just over a game and change for the 49ers last season before being shut down for the year.