The big Dutchman was found guilty of an offence in which he brought down Melbourne Victory midfielder Grant Brebner in an off-the-ball incident in the 54th minute.
The independent Match Review Panel found that Sibon had committed an offence, namely "Assault on a Player (e.g. violent conduct when not challenging for the ball)" against Brebner and proposed a sanction of two matches.
This is the minimum sanction for such an offence. The player has until 2:00pm (AEDT) tomorrow to accept the proposed sanction or refer the matter to a hearing by the FFA Disciplinary Committee on the question of the length of sanction imposed.