Detroit Lions running back Theo Riddick could be on the roster bubble.

The Detroit Free Press' Dave Birkett explained why on June 13.

The Lions have used Theo Riddick as their primary receiving back the last few seasons, and that's still the role he's best suited for, assuming he makes the team.

But I'm not sure Riddick is a lock for the 53-man roster – he'd make good trade bait, like Michael Roberts, in my opinion – and if the Lions do decide to go in another direction, they don't need to take (Kerryon) Johnson off the field on third downs.

Birkett foresees running back Kerryon Johnson assuming a bigger role with the Lions in the 2019 NFL season. More specifically he sees Johnson becoming a better receiving back. He even predicted Johnson will double his production of 32 passes from last season.

Long story short, Johnson's rise could result in Riddick's downfall in 2019.

The 28-year-old Riddick is entering his seventh NFL season. His best season came in 2016 when he had 728 all-purpose yards and six touchdowns. He recorded similar numbers in 2017 (730 all-purpose yards and five touchdowns).

Riddick had just 555 all-purpose yards in the 2018 NFL season. He didn't score a single touchdown. The emergence of Johnson, whom the Lions placed on season-ending injured reserve in December, could mean the end for Riddick in Detroit.

Could Theo Riddick ply his trade elsewhere in the 2019 NFL season? Stay tuned.