The Miami Dolphins wasted no time finding a roster replacement for Alexander Mattison, the running back who underwent season-ending neck surgery after being injured against the Chicago Bears. The Dolphins reportedly are adding Aaron Shampklin, a 25-year-old who played sparingly for the Pittsburgh Steelers last season.

The Miami Dolphins announced a series of roster moves earlier this week as the team looks to bolster their running backs corps. The moves come in response to a season-ending neck injury to Alexander Mattison, who the team signed in free agency this year with the goal of having him serve as a power-back option to compliment De’Von Achane.

The Miami Dolphins lost one of their running backs for the 2025 season as Alexander Mattison was placed on injured reserve after injuring his neck during Miami's preseason opener against the Chicago Bears on Sunday. Mattison had surgery in Chicago after being taken by ambulance to a local hospital, according to ESPN.