Raiders quarterback Jimmy Garoppolo is in concussion protocol, putting his status in question for when Las Vegas visits the Los Angeles Chargers on Sunday.

Garoppolo was injured in Sunday night’s 23-18 loss to the Pittsburgh Steelers.

Coach Josh McDaniels said Monday that he didn’t know when the injury occurred, but Garoppolo took several hits in getting sacked four times and his head bounced off the turf on one play in the fourth quarter.

Steelers safety Minkah Fitzpatrick was flagged for roughing the quarterback.

If Garoppolo can’t play, the Raiders will go with 15-year veteran Brian Hoyer or rookie Aidan O’Connell.

McDaniels said the discussions haven’t yet started on which QB to select, saying the decision will be what’s the “best thing for the team.”

“We’ll be hard at work having to manage that situation the best we can as it progresses,” McDaniels said.