The FAI have urged Republic of Ireland fans to hold off on making plans for the away clash with Gibraltar as UEFA have still not made a decision on where the game will be played.
Mick McCarthy's men face the Group D minnows in their first game of Euro 2020 qualifying on 23 March.
The Gibraltar FA had asked to play at the Victoria Stadium before the UEFA deadline but are currently in discussions with the governing body to assess the suitability of the venue.
With a capacity of just 2,300, playing the match at the Victoria would mean a serious scramble for tickets.
The alternative is the 30,000-capacity Estadio Algarve in Portugal. Ireland played Gibraltar there during qualification for Euro 2016.
An FAI statement released today said: "The FAI are awaiting a final decision from UEFA on confirmation of the venue for Ireland's EURO 2020 Qualifier away to Gibraltar on Saturday, 23 March.
"Ireland supporters are advised to wait until UEFA officially confirms the venue for this fixture before amending any of their travel plans as the FAI expects a final decision by early next week."