Ireland manager Martin O’Neill and player James McLean have until Friday to respond to FIFA charges of misconduct.
The two were critical of the referee in the aftermath of the 1-all draw at home to Austria this month in which Ireland had a goal disallowed and were denied a penalty.
If found guilty they could face match bans.
Meanhwile, the FAI’s investigation into alleged match fixing at Athlone Town is nearing a conclusion.
Irish football’s governing body have been looking into three games since May – where UEFA flagged up ‘irregular’ betting patterns on Asian markets.
They interviewed players, coaches and officials at the Midlands club with bank and phone records also scrutinised.
FAI CEO John Delaney says they’re close to making an announcement.