After Brown missed Sunday's practice, general manager Mike Mayock publicly stated that the Raiders needed to know whether the star receiver is "all-in or all-out" as he deals with his ongoing helmet issue.
Brown was absent for the majority of camp because he wanted to continue wearing his old helmet, which is no longer approved by the league. Brown's agent, Drew Rosenhaus, said the search for a suitable helmet in the receiver's preferred model - the Schutt Air Advantage - was still ongoing Sunday night.
The seven-time Pro Bowler reportedly located a 2014 edition of the helmet, but it failed a test required by the NFL, so he can't wear it.
Head coach Jon Gruden said Brown participated in the team's Saturday walkthrough and was nearing full participation in practice.
Brown is also dealing with frostbitten feet after undergoing cryotherapy without the proper footwear.