The NFL Players Association filed the grievance on behalf of Reid after Bengals owner Mike Brown reportedly asked if Reid would continue kneeling during the national anthem.
According to the NFL Network, the arbitrator ruled the Bengals were within their rights to ask if Reid would continue to kneel.
Reid began kneeling during the anthem during the 2016 season when he was with the San Francisco 49ers, as a way to support Colin Kaepernick and draw attention to issues of social injustice.
Reid was signed by the Carolina Panthers earlier this season.
And if you're wondering if he's stopped kneeling...
The answer is no.