The Miami Dolphins will be without running back Alexander Mattison for the entire 2025 NFL season due to a neck injury sustained during the preseason Week 1 game against the Chicago Bears. Mattison underwent neck surgery and has been placed on injured reserve. In response to this loss, the Dolphins signed two running backs, Aaron Shampklin and Mike Boone, to bolster their backfield. The current running back roster now includes De'Von Achane, Jaylen Wright, Ollie Gordon II, Aaron Shampklin, and Mike Boone. Head coach Mike McDaniel also indicated that wide receivers Tyreek Hill and Jaylen Waddle are day-to-day but expected to return to practice ahead of the joint practice with the Detroit Lions. Additionally, edge rusher Chop Robinson was carted off the field during a joint practice but later reported that his injury was not serious. The Dolphins are adjusting their roster and preparing for upcoming games amid these developments.