Alexander Mattison

Dolphins signed Alexander Mattison, formerly of the Raiders, to a one-year contract.

The Raiders and Dolphins effectively trade backup running backs with Raheem Mostert headed to Vegas. The Dolphins had just two running backs rostered, both of whom possess elite speed and agility but perhaps lack physicality. The 5-foot-11, 220-pound Mattison fills that need. He is unlikely to assume a voluminous rushing role but could perhaps be annoying for De’Von Achane’s fantasy value in a goal-to-go role.