Griffin left the game in the first quarter after dislocating his left ankle and the team is hopeful he will miss just four to five weeks.
Cousins replaced Griffin and led Washington to a 41-10 victory. He completed 22 of 33 passes for 250 yards, two touchdowns and zero interceptions.
“This is Robert’s team,” Cousins told reporters after Sunday’s win. “My job is to be the backup quarterback, and if called upon to come in and play, then I better play and help this team win. That job doesn’t change. This is Robert’s team.”
Cousins has started four games and played in eight the past two seasons in relief of Griffin, completing 56.2 percent of his passes and throwing eight touchdowns and 10 interceptions.
Receiver DeSean Jackson also left the game against the Jaguars. He reportedly has a bruised shoulder and his status moving forward is uncertain.
Washington will play its first divisional game in Week 3 against the Philadelphia Eagles.
- Paul Palladino