Antonio Brown filed a second grievance with the NFL on Monday in his fight to wear his preferred helmet, though it didn't prevent him from practicing with the Oakland Raiders on Tuesday.
"It's a certified helmet," head coach Jon Gruden told reporters regarding the helmet Brown wore during that practice, per Scott Bair of NBC Sports Bay Area.
"He's all-in. Ready to go," Gruden added, according to Vic Tafur of The Athletic, noting he doesn't believe Brown's feet issues are a concern at this point.