Oakland Raiders starting right tackle Donald Penn was placed on injured reserve Wednesday with a groin injury.
He suffered the injury in Sunday's overtime victory over the Cleveland Browns. Coach Jon Gruden said Wednesday the Raiders hope he can return at some point this season.
The Raiders have signed offensive tackle Ian Silberman off the Tennessee Titans' practice squad to fill his roster spot.
Silberman was with the Raiders the past two training camps and was on the team's active roster last December and on the initial 53-man roster on Sept.