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.

The Dolphins and free agent RB Alexander Mattison agreed to terms. Here’s what to know and how he fits in Miami.

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 Dolphins dealt with their backup quarterback need by agreeing to a deal with former Jets and Broncos passer Zach Wilson. Additionally, the Dolphins added to their wide receiver depth with a deal with the Titans' Nick Westbrook-Ikhine.

In our latest mock, the Combine and free agency shake up the first round of the 2025 NFL Draft. But the Miami Dolphins stick to their plan.

The Dolphins are re-signing offensive lineman Liam Eichenberg to a one-year deal, Adam Schefter of ESPN reports.