Washington's head coach stands by his defensive coordinator, saying that breakdowns against the Vikings were execution-related.
The veteran cornerback will be a free agent, but defensive coordinator Jim Haslett called re-signing him an offseason priority.
Kerrigan currently has 6-1/2 and Orakpo has 8-1/2, with four games left.
Brandon Meriweather was suspended Monday and Reed Doughty suffered a concussion in the Chicago game Sunday.
Duo debuted for Redskins in Dallas after being suspended for season's first four games.
Backup linebacker Keenan Robinson is hurt, while defensive end Jarvis Jenkins and reserve linebacker Rob Jackson are suspended from the first four games of the season.
With return of Brian Orakpo, Brandon Meriweather and Adam Carriker, members of the Redskins defense are convinced last season's struggles will be left behind.
Seven-year veteran probably will be switched to outside linebacker
As he enters his fifth season, he looks to rebound from injury and try again to establish himself as one of the NFL's best pass-rushing linebackers.
The unit was expected to be the team's strength, but struggled badly over the first half of the season before showing improvement after the bye.