Scott Mruczkowski is seen dejected on the bench in the closing minutes of the fourth quarter against the Oakland Raiders on Dec. 5.
The San Diego Chargers say they'll place guard Scott Mruczkowski on season-ending injured reserve Thursday due to a concussion.
He was hurt in Sunday's loss to the Chicago Bears that dropped the Bolts to 4-6 and into a tie for last place in the AFC West.
Mruczkowski was filling in for Kris Dielman, who suffered a concussion Oct. 23 at the New York Jets and then had a seizure on the flight home.
The Chargers, who've lost five straight games, host Tim Tebow and the Denver Broncos on Sunday.