The Seahawks have not confirmed the signing, but it's expected to become official on Saturday.
If Hargrove signs by Saturday, he would be eligible to play in Sunday’s game at San Francisco, and the Seahwks would have to release a player to clear a spot on the 53-man roster.
Hargrove was released by Philadelphia during final roster cuts last week.
After overcoming drug abuse and a lengthy NFL suspension, Hargrove resurfaced with New Orleans in 2009, finishing with 42 tackles and five sacks during the Saints’ Super Bowl run.
At 6-2, 275 pounds, Hargrove is a high-motor guy who could serve as a replacement for Jimmy Wilkerson, who wound up on the season-ending injured reserve after suffering a knee injury during Seattle’s final preseason game against Oakland.
Hargrove, 28, appears to have the ability to play defensive end on early downs, and then move inside as a pass rusher on third down.
This week Seattle head coach Pete Carroll said the team was still looking for someone with a similar skill set as Wilkerson to fill that role.
“We don’t have a guy like Jimmy,” Carroll said during his Wednesday press conference. “Jimmy had an expertise of playing defensive end on early downs and going inside. We don’t have a guy just like that, so we’re going to use a combination of guys to rush and see what we can find out.
“We’ll use [Brandon] Mebane more than we had thought we would inside, we’ll count on Red [Bryant] to move inside some on pass rush situations, so we’ll use a combination of guys to get that done.”
Hargrove talks about overcoming his battle with drugs in the video below.