Las Vegas Raiders quarterback Derek Carr left in the first quarter of Thursday night’s 30-27 overtime loss to the Los Angeles Chargers with a strained left groin injury and missed the rest of the contest.

On a third-and-goal play at the Chargers’ 2-yard line, Carr pulled up while scrambling around right end and ran out of bounds. He walked straight to the locker room.

Marcus Mariota replaced Carr and led the Raiders on a seven-play, 86-yard scoring touchdown drive on his first series. Mariota capped it by hitting tight end Darren Waller with a 35-yard touchdown pass to give Las Vegas a 10-7 lead.

Raiders coach Jon Gruden didn’t know the severity of Carr’s injury immediately after the game, but he felt it wasn’t minor.

“I don’t believe it’s a real tear, but if he can’t finish the game, it’s got to be pretty significant,” Gruden said.

Carr completed 3 of 5 passes for 53 yards before sustaining the injury.

Mariota completed 17 of 28 passes for 226 yards, one touchdown and an interception while also rushing for a game-high 88 yards and a touchdown on nine carries.

Also, Raiders receiver Hunter Renfrow departed the contest due to a concussion.