Oakland Raiders receiver Louis Murphy missed Saturday morning's practice with a concussion, after being hit in the head in practice on Friday.
"I took a knee to the head on an out route," he said. "Nnamdi kneed me in the back of the head. Finished practice, felt pretty good. Woke up for the second practice with a horrible headache."
Coach Tom Cable said the team has to go through the concussion "protocol" and Murphy will be out a day or so.
Murphy said he has never had a concussion before.