Ansah's new pact is expected to include $5.5 million in guaranteed cash. He is expected to sign the deal Thursday.
The No. 5 overall pick in the 2013 NFL Draft played his first six seasons in Detroit, making the Pro Bowl in 2015. Ansah had 44 tackles, 15 tackles for a loss, 12 sacks, a forced fumble and a fumble recovery in 14 starts during his 2017 campaign.
The 6-foot-5, 275-pound pass-rusher had a career-high 14.5 sacks in 2015. Ansah has 48 sacks in 80 career appearances. The BYU product has started 73 games during his NFL tenure.
Ansah had a $17.1 million salary in 2018, as he played on the franchise tag. He missed nine games last season due to a shoulder injury. Ansah could miss time this off-season and possibly during the regular season after having surgery on the shoulder.
Seattle reports to OTA off-season workouts May 20 and has mandatory minicamp from June 11 to 13.