D.J. Hayden continues to struggle to stay on the field and will miss the first six games of the season after the Oakland Raiders placed him on the Physically Unable to Perform List.

Hayden missed all of last offseason as he recovered from his second heart surgery and missed time during the regular season with a groin injury.

But he injured his foot during OTAs this past summer, and though the injury originally was thought to be minor, Hayden still hasn't recovered fully.