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Detroit signed Knight off their practice squad Wednesday.
Knight's addition to the team suggests the Lions could be in need of running back depth Sunday against the Falcons, and possibly beyond, after David Montgomery (thigh) came out of the Week 2 loss to Seattle with an injury. Even if Montgomery sits out, Knight could find himself third in line for work out of the backfield behind rookie first-round pick Jahmyr Gibbs and Craig Reynolds.
