Crawley defender Paul Connolly has been suspended for five matches following an altercation with a fan during last week's 1-0 defeat at Brentford.
The ban, which was imposed by an independent regulatory commission, can be appealed by the player, who has accepted the charge but disputed the length of the ban.
The incident at Griffin Park came in the 90th minute of the game, with his side 1-0 down to promotion chasing Brentford, the ball was kicked into the stands and Connolly went to retrieve it.
As he approached to get the ball, a Brentford fan threw the ball straight at him, which prompted an angry response from the player, who seemed to raise his arms towards the fan.
The incident only came to light after the game, as the match official did not see it at the time, and the ban, unless overturned will keep him out of the remainder of Crawley's fixtures.