49ers battered in LA, but neither Joe Staley nor Dante Pettis believed to have sustained long-term knee injuries

The San Francisco 49ers didn't escape their bout with the Los Angeles Chargers unscathed. Several players were injured during the 29-27 loss at the StubHub Center.

Head coach Kyle Shanahan provided the following injury updates after the game.

• QB C.J. Beathard — had the wind knocked out of him.
• RB Matt Breida — shoulder injury.
• WR Marquise Goodwin — hamstring injury.
• T Mike McGlinchey — knee injury in the second quarter; returned to the game.
• WR Dante Pettis — knee injury in the first quarter; didn't return.
• C Weston Richburg — knee injury in the first quarter; returned to the game.
• T Joe Staley — knee injury in the second quarter; didn't return.
• DL Solomon Thomas — shoulder injury.

There was some good news. It does not appear that two of the players who did not return to the game, Staley and Pettis, suffered long-term knee injuries, according to NBC Sports Bay Area. While neither is believed to have damaged their ACLs, both players will undergo MRI examinations on Monday.

McGlinchey returned to the game, but it was clear he was hurting.

"Losing both of our tackles there for a while was scary," Shanahan said after the game. "We had to finish the first half without them. Staley wasn't able to return. I'm happy McGlinchey toughed it out. His obviously wasn't as bad as Staley's, but I know it was hard for him to go that second half. I'm real proud of our center. He got hurt on the first play of the game, had to come out, but he battled through that entire game, and we needed him to because there weren't many guys left."

The number of injuries will force the 49ers to take a look at other options. General manager John Lynch already said last week that the team would likely re-evaluate the backup quarterback role in the coming week. Shanahan doesn't believe the re-evaluation will be limited to the quarterback position.

"We're going to have to look into all of it," Shanahan said. "We're banged up at O-line, safety, receiver, quarterback. So it all plays out, but we're going to try to get enough guys in there to play."