A further five Republic of Ireland players are out of Sunday's Nations League game against Wales after one of them tested positive for Covid-19.
Four other squad members identified as close contacts of the player have also been stood down for Sunday's match.
Aaron Connolly and Adam Idah are already out because of a Covid issue.
They were set to feature in Thursday's Euro 2020 play-off game in Slovakia but were ruled out shortly before the kick-off after being deemed to have been in close contact with a member of the Republic's backroom team who tested positive for Covid-19.
Manager Stephen Kenny made an appeal to the Irish medical authorities about the duo's exclusion from the match but it was unsuccessful.
In a further twist, the FAI statement said the staff member who tested positive in Bratislava on Wednesday may have received a "false positive" result.
The FAI said two tests carried out on the individual on Saturday "confirmed no trace of Covid-19", adding that it would now "discuss the issue with Uefa".
"In light of these developments, the FAI wishes to make it clear that it complied with all Uefa and HSE [Irish Health Service Executive] Covid-19 guidelines concerning the availability of players and the well-being of staff around the Slovakia v Republic of Ireland fixture in Bratislava on Thursday night."