I also heard them mention it on Total Access, I don't think the injury is that serious at all. I think I heard he'll about out for a month or so, definitely will be back in the time for the regular seasons; probably even pre-season.
he lead the league in average for backs with over 200 carries, 4.9ypc. this year i think he is really set on proving he can play a whole season, he was injured last year for the end of the season, but i think if titans were in playoff race he would of played. For most the season tho he was in top 5 for yards.