Oakland Raiders wide receiver Antonio Brown has only partially participated in one practice thus far in training camp, which is due to the fact that he is having problems with both of his feet.

Brown went to see a foot specialist, but the Raiders don't seem too concerned.

Apparently, Brown is having more issues with his right foot than his left foot:

“It's his right foot bothering him more than his left foot,” ESPN's Chris Mortesen reported. “I did text Jon Gruden a short time ago and he did say, ‘I hope they figure it out pretty soon,' because they don't have any idea what's going on there.”

Brown was placed on the non-football injury list as soon as he arrived at training camp, an arrival that consisted of the 31-year-old showing up in a hot air balloon.

He was then removed from the list shortly after, but has since been sidelined after taking part in one practice.

While Oakland may not be all that worried about Brown's ailment, it has to be a bit concerning that the Raiders' No. 1 receiver has barely gotten any time to develop a rapport with Derek Carr and the rest of the offense.

Remember: it's not like Brown has been in Oakland for a long time, either, as the Raiders just traded for him in March, so they were obviously hoping training camp would serve as a time where he could learn the offense and get in the swing of things in his new digs.

Brown spent the first nine years of his career with the Pittsburgh Steelers, making seven Pro Bowls.