Arizona Cardinals wide receiver John Brown was absent from Wednesday's practice because of headaches after missing three weeks of training camp with a concussion.
The speedy receiver was cleared to practice last weekend after his extended absence due to post-concussion symptoms. But his recovery hit a setback Wednesday, and his Week 1 status is now in question.
It's possible Brown could be placed back on the concussion protocol, meaning he would have to start from scratch in proving he is not suffering from head injuries.
Brown hauled in 65 receptions for 1,003 yards and seven touchdowns last season.