Joe Flacco suffered a concussion during Thursday night's 40-0 win over the Miami Dolphins.

Flacco left the field bloodied and dazed late in the first half. The Baltimore Ravens quarterback took a hard shot from Kiko Alonso after sliding to the ground on a run. Flacco's helmet immediately flew off and he went to the locker room with a glassy-eyed look and blood coming from his left ear.

Flacco was ruled out of the game during halftime. It is the first reported concussion in Flacco's career.

"Joe had a concussion and a cut ear," John Harbaugh said. "They were stitching that [ear] up without any anesthesia, so he's a tough dude. That's as much as I know about it."