Jon Gruden is unsure of the severity of Derek Carr’s groin injury, but the Las Vegas Raiders head coach was proud of Marcus Mariota’s performance.

Carr suffered a groin injury and was replaced by Mariota as the Raiders’ playoff chances were all but ended in a 30-27 overtime loss to the Los Angeles Chargers on Thursday.

Mariota almost inspired the Raiders to victory, completing 17 of 28 passes for 226 yards, a touchdown and an interception, while rushing for 88 yards and another score.

Asked to provide an update on Carr, Gruden told reporters: “I don’t believe it’s a real tear.

“But obviously if he can’t finish the game it’s got to be pretty significant.”

Mariota became the first QB to have 200-plus passing yards and 75-plus rushing yards despite not starting the game since M.C. Reynolds in 1958.

Gruden praised the former Tennessee Titans quarterback, who joined the Raiders in March.

“It just shows the kind of player, the kind of football character he has,” Gruden said.

“Our offensive coordinator [Greg Olson] isn’t here either. You lose Derek and then we changed gears offensively and Marcus came in and did a great job and really proud of him.

“I think that this kind of puts an exclamation point on why we signed him and just wish we could’ve won the game for him.”