When Oakland Raiders wide receiver Antonio Brown showed up to training camp late last month and was then immediately placed on the non-football injury list, people wondered what was going on.

Brown was then removed from the list in less than 48 hours and partially practiced with the team, but he has not practiced since.

It was later revealed that Brown sustained frostbite on his feet as a result of spending time in a cryotherapy chamber in France without wearing the proper footwear.

Now, Brown's agent, Drew Rosenhaus, said that his client needed laser treatment for his feet, according to Vic Tafur of The Athletic.

Of course, Brown's feet were not the only issue, as the 31-year-old was also embroiled in a battle with the NFL over the usage of his helmet, which is now banned by the league for not being certified by the NOCSAE.

Brown, who threatened to step away from the game if the league did not allow him to don the helmet he wore for the first nine year of his career, proceeded to file a grievance against the NFL and lost.

But, Brown will not be retiring, as he took to Twitter after the decision to announce that he would soon be rejoining his teammates in preparation for the 2019 campaign. He then returned to Raiders training camp on Tuesday and is expected to be ready for Week 1.

Oakland acquired Brown in a trade with the Pittsburgh Steelers earlier this offseason, sending a couple of draft picks to the Steelers in return.