"I know I probably wasn't your favorite player over the past decade, but Eagles fans I'm fired up to be playing for you guys now," Kerrigan wrote on social media.
The 32-year-old Kerrigan, who was a first-round pick by Washington in the 2011 NFL Draft, spent the first 10 years of his career with the franchise. During his time in Washington, he racked up 147 quarterback hits and 95.5 sacks -- the most in franchise history.
Kerrigan started only one game last season and played 38% of the team's defensive snaps. Despite the lowest snap percentage of his career, he recorded 5.5 sacks and five tackles for a loss in 2020.
Kerrigan joins a pass rusher group in Philadelphia that includes Brandon Graham, Derek Barnett and Josh Sweat.
"They've got Brandon Graham and Derek Barnett, guys who are entrenched and are bona fide studs in this league," Kerrigan told ESPN. "But I know they rotate their guys a lot. Whether I'm a starter or a reserve, I still imagine I'll get a lot of playing time. That was a big thing for me."
In 156 career games, Kerrigan also has notched 453 total tackles, 26 forced fumbles, four fumble recoveries, three interceptions and 25 passes defensed.