Antonio Brown has reported to training camp with the Oakland Raiders.

"I'm extremely grateful to be here," Brown said. "I'm dealing with a lot of adversity. It's on the up and up, so I'm excited to be back and see my teammates and get in the groove of things here shortly."

The wide receiver was away from the Raiders while dealing with frostbitten feet from a cryogenic therapy chamber mishap and filing a grievance over wearing his old helmet.

There is no timetable for Brown to return to practice, but Jon Gruden fully expects the star to be ready for Week 1.

"We'll work him back in," Gruden said. "Obviously it's great to have him back. We've had a pretty good understanding -- in spite of what people think -- of what's going to happen. Now we're ready to get rolling."