ALAMEDA, Calif. — Head coach Dennis Allen said X-rays on quarterback Derek Carr’s ankle were negative. He was announced as having a knee/ankle injury, but Carr said afterward he essentially had injuries to both legs.

He was hurt on an 8-yard scramble. On the next play, Carr threw an incomplete pass to Brice Butler that was overturned to a 16-yard gain. During the replay, Carr discovered he couldn’t stand.

“I’m not going to come off the field if I can help it,” Carr said. “It got to the point where I could barely stand on it. I guess the adrenaline wore off a little bit, but I tried to stay in. That’s how much on fire it was.”

Carr said of his injuries, “Both of ’em are sprained. I’ll do my best to get back out there as fast as I can.”

The Raiders return Oct. 12 against San Diego. Matt McGloin came in for Carr, with Matt Schaub missing the game because of a personal issue. ESPN reported last week Schaub was with his wife, who had given birth prematurely to their son.