The Titans are signing RB Adrian Peterson, according to NFL Network's Ian Rapoport. Peterson will start on the practice squad but figures to be elevated quickly, likely before Sunday night's game vs. the Rams. Peterson is 36 now and managed just 3.9 yards per carry on 156 attempts for the Lions last year. He ranked 43rd in Pro Football Focus' rushing grades among 47 RBs with 100+ carries. That said, Peterson might be the favorite to lead the Titans in carries the rest of the way. His primary competition will come from RB Jeremy McNichols, who's listed at 205 lbs. and has yet to top 11 carries in an NFL game. We'll see exactly how the split shakes out. McNichols does figure to handle most of the passing-down work, though, which caps Peterson's fantasy ceiling.