It is Tuesday so there must be another story about Antonio Brown.

Yep, there is, and it appears that he has filled a second grievance against the NFL over his preferred helmet.

Not long after losing a grievance against the NFL over the helmet he wants to wear this season, the Oakland Raiders wide receiver filed a second complaint against the league.

In this one, Brown argues that he should be given a one-year grace period to phase out his helmet, the Schutt Air Advantage, that he has worn during his entire NFL career. He claims that the NFL has given other players the one-year grace, but they are arbitrarily applying the rule. However, the NFL and NFL Players Association eliminated the grace period after last season.

Brown missed practice on Sunday while looking for a new helmet he is comfortable with but returned to Oakland’s training camp Monday morning.

This latest development came a day after Raiders GM Mike Mayock called out Brown in the media.

"So from our perspective, it's time for him to be all in or all out," Mayock told reporters. "So we're hoping he's back soon. We've got 89 guys busting their tails. We are really excited about where this franchise is going and we hope A.B. is going to be a big part of it starting Week 1 against Denver."

"Antonio is very genuine," his agent, Drew Rosenhaus, said on Sunday. "He wants to be there. He wants to be a part of the team. He wants to practice. But he'd also like to do it with the helmet that he's worn his entire life. He wore this helmet in pee-wee football, high school football, in college at Central Michigan. And he also wore this helmet his nine-year (NFL) career.”

It was just last week that Brown had a grievance turned down by the league which centered around the helmet he wants to use which the league has deemed unsafe for on-field play. Brown reportedly left the team and threatened to retire if he could not use the helmet, but his camp walked it back stating that he never threatened to retire.

Brown believed that he had found a suitable replacement but it did not meet the additional testing parameters.

The 31-year old, who was acquired by Oakland from the Pittsburgh Steelers in a trade, has not appeared in a pre-season game as he continues to recover from a frostbite injury to his feet that occurred while using a cryogenic therapy chamber in France earlier this summer.