Jonathan Gannon’s fiery sideline behavior may cause some union problems.
The NFL Players Association (NFLPA) is examining whether the Arizona coach’s reaction Sunday after per USA Today.
The union has not yet launched an investigation but is examining the situation, in which Gannon seemed to hit the running back at least once.
Demercado’s fumble took what could have been a likely game-sealing touchdown off the board, and the Titans rallied to stun the Cardinals for their first win of the year.
Gannon has since apologized to the running back for his actions.

