“If he does have the procedure, and it’s not confirmed as yet, it could be a little bit of washout to free out the ankle. That would be two weeks maybe.

“If it’s a little bit more significant it could be four-six weeks.”

Long would likely have started Ireland’s games against Northern Ireland and Denmark had he been fit but his injury may represent a good opportunity for his teammate Michael Obafemi to impress for the first time in an Irish shirt after his call-up to the squad last week.

The FAI announced the latest changes to the Irish squad on Monday morning.

Irish U19 captain Lee O’Connor has been called up as Long’s replacement and will link up with the senior squad at the FAI National Training Centre as they prepare for Thursday’s clash with Northern Ireland at the Aviva.

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Republic of Ireland Squad

Goalkeepers: Darren Randolph, Colin Doyle, Caoimhin Kelleher

Defenders: Seamus Coleman, Cyrus Christie, Matt Doherty, Richard Keogh, Shane Duffy, Kevin Long, John Egan, Darragh Lenihan, Lee O’Connor*, Enda Stevens

Midfielders: Robbie Brady, Jeff Hendrick, Glenn Whelan, Conor Hourihane, Harry Arter, David Meyler, Shaun Williams, Alan Browne, Callum O’Dowda, James McClean

Forwards: Scott Hogan, Sean Maguire, Callum Robinson, Aiden O’Brien, Ronan Curtis, Michael Obafemi