The Miami Dolphins added a power-running veteran to their running back room on Thursday, agreeing to a deal with Alexander Mattison, a person with knowledge of the agreement told The Associated Press. The person spoke to the AP on condition of anonymity because the deal had not been finalized.

Dolphins add running back Alexander Mattison. He has started 26 career games, including 7 for the Raiders last season.

Miami's ineptitude on third-and-1 run success rate was exceeded by only the Patriots. Enter Alexander Mattison, free agent running back addition. Pro Football Focus graded Mattison as 42nd among 47 NFL running backs last season.

NFL free agency has begun, and we're keeping track of every major signing, trade and release of the 2025 offseason, with analysis from our NFL Nation reporters and grades from our experts. The new league year began March 12 at 4 p.m. ET, when free agent signings could become official. The first round of the 2025 NFL draft begins April 24 on ESPN.

The Miami Dolphins announced new contracts for four of their players who were set to become free agents Wednesday afternoon. New deals for safety Elijah Campbell and outside linebacker Quinton Bell were already reported ahead of the start of the new league year.