Raiders QB Jimmy Garoppolo in Concussion Protocol After Loss to Steelers

Garoppolo was evaluated for a concussion after Sunday's loss to the Steelers.
It's unclear when Garoppolo suffered the concussion during the game.
If Garoppolo can't play next week, the Raiders may start Brian Hoyer or rookie Aidan O'Connell at QB.
Garoppolo passed for 324 yards against Pittsburgh but had 3 interceptions.
The Raiders signed Garoppolo in the offseason after moving on from Derek Carr.