Zenner and recent signee C.J. Anderson figure to compete for carries behind Kerryon Johnson, ESPN.com's Michael Rothstein reports.

The Lions also have Theo Riddick in a crowded backfield, though the pass-catching specialist might be traded or released before Week 1 to free up $3.7 million in cap space. Johnson is the only one of the bunch signed beyond 2019, and he already proved his merit as a lead back with 5.4 yards per carry and 32 catches in 10 games during his rookie season. Zenner's wealth of experience on special teams could allow him to stick on the 53-man roster even if he lands fourth on the depth chart at running back.

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