Perth defender Dino Djulbic is facing a possible 18-month ban after being sensationally sent off in the Glory's 5-2 defeat against Sydney FC.The Bosnian-born left back was issued with a straight red card in the 20th minute of the A-League match for allegedly spitting at referee Peter Green.Djulbic will front an independent disciplinary committee this week, and if found guilty of spitting at a match official will face anywhere between a six-match to 18-month ban, as per Football Federation Australia's national disciplinary regulations.