Henderson expects Simmons to serve as depth for Seattle in 2021 after he started six games coming off the bench in 2020.
Simmons, 26, wound up going undrafted out of USC back in 2017. He later signed on with the Raiders, but was waived coming out of the preseason and later signed to their practice squad.
Simmons returned to Oakland on a futures contract for the 2018 season before being waived and later claimed by the Seahawks. Since then, Simmons has been placed on injured reserve twice due to knee injury and wound up missing the entire 2019 season.
Seattle declined to tender Simmons in 2020 but ultimately brought him back on a one-year deal. Seattle again declined to tender Simmons, this time as a restricted free agent, in 2021.
In 2020, Simmons appeared in 14 games for the Seahawks and made six starts at guard. Pro Football Focus had him rated as the No. 71 guard out of 80 qualifying players.