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 running back Emari Demercado let go of the ball before scoring , resulting in a touchback that loomed large in an embarrassing 22-21 loss to winless Tennessee, is worth investigating, 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. 5

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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.

“I just told [the team], I kind

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