UPDATE: Adam Schefter reported that Penny "should be ready" by Week 1
This makes Penny questionable for the start of the season. If the rookie is unable to play in Week 1, the lead running back duties will likely fall upon Chris Carson, though someone like C.J. Prosise or J.D. McKissic could have a role on third down. Ultimately, this news could just make Penny a value in fantasy drafts.