The Lions released Snell on Tuesday, Jeremy Fowler of ESPN.com reports.
Snell signed a contract with the Lions on Thursday.
Snell played exclusively on special teams during the Steelers' 28-14 win over the Browns on Sunday.
Snell rushed six times for 24 yards while securing his lone target for 11 yards during the Steelers' 19-16 win over Atlanta on Sunday.
Snell doesn't have an injury designation ahead of Sunday's matchup against Atlanta, Chris Halicke of DKPittsburghSports.com reports.
Snell (knee) was listed as a limited participant on the Steelers' injury report Thursday, per Mike DeFabo of The Athletic.
Snell rushed 12 times for 62 yards and a touchdown in Sunday's 24-17 win over the Colts. He also caught his only target for six yards while fellow Steelers running back back Najee Harris (abdomen) didn't finish the game.
Snell didn't record any touches during the Steelers' 24-20 loss to the Jets on Sunday.
Snell didn't record any touches during the Steelers' 29-17 loss to the Browns on Thursday.
Snell didn't record any touches during the Steelers' 17-14 loss to New England on Sunday.