The Football Association of Ireland has confirmed that a staff member received a false positive test result for Covid-19 in Bratislava on Wednesday.
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It means that Adam Idah has been recalled to the squad, having missed out on Thursday's penalty shootout defeat to Slovakia as a close contact of the staff member.
The entire squad were tested again on Sunday, with results expected on Monday afternoon.
Idah is one of five players called up by manager Stephen Kenny for Wednesday's Nations League clash with Finland in Helsinki.
QPR midfielder Ryan Manning has been called into the senior squad for the first time, along with Derby midfielder Jason Knight, West Brom defender Dara O'Shea, and Portsmouth striker Ronan Curtis.
All five players have joined the squad in Dublin before they travel to Finland on Tuesday.
Sunday's draw with Wales leaves Ireland third in Group B4, after the Finns beat Bulgaria 2-0 at home later in the day.
Goalkeepers: Darren Randolph (West Ham United), Caoimhin Kelleher (Liverpool), Mark Travers (Bournemouth).
Defenders: Matt Doherty (Tottenham Hotspur), Enda Stevens (Sheffield United), Shane Duffy (Celtic, on loan from Brighton & Hove Albion), Kevin Long (Burnley), Cyrus Christie (Nottingham Forest, on loan from Fulham), Dara O'Shea (West Bromwich Albion).
Midfielders: Conor Hourihane (Aston Villa), James McCarthy (Crystal Palace), Jeff Hendrick (Newcastle United), Jayson Molumby (Brighton & Hove Albion), Jack Byrne (Shamrock Rovers), Robbie Brady (Burnley), Josh Cullen (Anderlecht), Jason Knight (Derby County), Ryan Manning (Queens Park Rangers).
Forwards: James McClean (Stoke City), Daryl Horgan (Wycombe Wanderers), Sean Maguire (Preston North End), Shane Long (Southampton), Adam Idah (Norwich City), Ronan Curtis (Portsmouth)