PITTSBURGH - DECEMBER 06: Louis Murphy #18 of the Oakland Raiders celebrates his game winning touchdown with nine seconds left on the clock while playing the Pittsburgh Steelers on December 6, 2009 at Heinz Field in Pittsburgh, Pennsylvania. Oakland won the game 27-24. (Photo by Gregory Shamus/Getty Images)
Oakland Raiders wide receiver Louis Murphy is being held out of training camp practice with a concussion.
Murphy says he got hurt when he was kneed in the helmet by teammate Nnamdi Asomugha during practice Friday. He has a bad headache and missed practice Saturday.
Coach Tom Cable says Murphy will not return until he passes a series of tests that shows he has recovered. Murphy says he has never had a concussion before.
Murphy is being counted on heavily in his second year in the NFL. He led all Raiders wideouts with 34 catches for 521 yards and four touchdowns as a rookie last season.