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.

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.

The person spoke to the AP on condition of anonymity because the deal had not been finalized. At 5-foot-11, 220 pounds, Mattison brings size behind speedster De'Von Achane. Mattison spent the first five seasons of his career in Minnesota — he rushed for 2,