Brown loses helmet dispute

Oakland Raiders receiver Antonio Brown lost his grievance with the NFL on Monday over his use of an old helmet that is no longer certified as safe to use for practice or play.

The arbitrator issued the ruling after holding a hearing Friday with Brown, representatives from the league and the players’ union.

“While I disagree with the arbitrator’s decision, I’m working on getting back to full health and looking forward to rejoining my teammates on the field,” Brown said on Twitter.

Brown has not participated in a full practice with the Raiders after starting training camp on the nonfootball injury list because of injuries to his feet that reportedly came from frostbite suffered while getting cryotherapy treatment in France.

Oakland acquired the prolific receiver from the Pittsburgh Steelers in exchange for third- and fifthround picks in March.

Oakland cornerback Nevin Lawson was suspended four games for violating the NFL’s policy on performance-enhancing substances . ... Cleveland defensive end Chad Thomas suffered a sprained neck but avoided a more serious injury during a scary moment at training camp in Berea, Ohio. Thomas was immobilized on the field and taken by ambulance to a hospital. ... New England offensive tackle Isaiah Wynn, whose rookie campaign ended because of a torn Achilles’ tendon in the preseason last year, participated in fullcontact drills. players. The opinion filed in the U.S. 9th Circuit Court of Appeals noted that the Pac-12 and NCAA didn’t provide Dawson with a scholarship or have the power to hire or fire him. Dawson played linebacker for USC from 2011 to 2015. His lawsuit sought unpaid overtime and wages, interest and a variety of unspecified damages.