UPDATE: Brown Returns to Raiders After Losing Grievance

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The Oakland Raiders have their star wide receiver in camp. 

ESPN reports Brown returned to Raiders camp in Napa, California on Tuesday. 

He posted on social media Monday that he was looking forward to rejoining his teammates on the field after he lost a grievance against the NFL over wearing his old helmet -- a 10-year-old Schutt Air Advantage model.

Brown has not been with the Raiders since being limited in a practice and leaving early on July 30.

The wide receiver took to social media Tuesday to find a version of his preferred-style helmet that is less than 10 years old. 

It is not clear whether, if Brown could even find one and get it certified by NOCSAE, the NFL would sign off on it, because the technology is outdated.

He had reportedly threatened to retire if he was not allowed to wear his helmet. 

Brown was acquired by Oakland from the Pittsburgh Steelers in March and promptly signed a three-year, $50.125 million contract.

Brown has also been dealing with frostbitten feet suffered in a cryotherapy mishap in France last month.