In his career, Ngata has 31.5 career sacks and won a Super Bowl with the Baltimore Ravens in 2012. Douglas served as a scout in Baltimore from 2000 to 2015. He will now join another veteran defensive lineman with a ring in Michael Bennett, whom the Eagles recently acquired in a trade from the Seattle Seahawks.
Allen, who specialized in stopping the run, played 41 percent of the defensive snaps in 2017 as part of an Eagles line rotation that included Fletcher Cox, Tim Jernigan and Destiny Vaeao. But line depth was huge for the Eagles last season; seven of their defensive linemen played at least 400 snaps, most in the National Football League, per ESPN Stats & Information.
The Eagles are also expected to sign former Denver Broncos linebacker Corey Nelson to a one-year deal worth $2.25 million, according to multiple reports.More news: Winter Storm Warning & More Rain & Snow on The Way
In 2017, the 34-year-old only played five games due to an elbow injury and was placed on the IR.
Although he has contemplated retirement in the past, Ngata likely didn't want to go out while he was injured.
After spending most of his career as one of the league's best interior defensive linemen in a 3-4 defense with the Baltimore Ravens, he transitioned to a 4-3 with the Lions past year. He is a five-time Pro Bowler, two-time All-Pro selection and a Super Bowl champion with the Ravens. He has 29.5 career sacks and 6.0 career forced fumbles.