Antonio Brown's time with the Oakland Raiders has gotten off to an interesting start.
He started training camp on the non-football injury list, and it was later reported that he had frostbite from a cryotherapy machine after using it "without the proper footwear".
The situation appears to only have gotten worse from there as Pittsburgh NBC affiliate WPXI reports the former Steeler has gone "radio silent" and the Raiders have "zero clue where he is or what the progress of the foot injury is".
Brown reportedly saw a foot specialist earlier this week and has been considered day to day as he recovers, though the team has not publicly commented on the receiver's status yet.
Reports emerged later on Friday suggesting Brown had filed a grievance against the NFL in an attempt to keep wearing a helmet model that is now banned.
The helmet, made by Schutt and since discontinued, is not certified by the National Operating Committee for Standards and Athletic Equipment, and NFL rules stipulate only NOCSAE-certified helmets can be used.
Shortly after those reports, NFL Media's Michael Silver sent a series of tweets addressing Brown's absence from camp that centred on the helmet issue.
"He's still freaking out about it," Silver quoted an anonymous Raiders player as saying. “He hasn't been here for awhile, and no one knows where he's at."
Brown led the NFL in touchdown receptions last season with 15 and finished with more than 1,200 receiving yards for the sixth consecutive season.
The Raiders open their preseason on Saturday against the Los Angeles Rams.
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