Darron Gibson and the uncapped trio of Alan Judge, Eunan O’Kane and Adam Rooney have been named in Martin O’Neill’s squad for the upcoming UEFA Euro 2016 Group D qualifiers against Germany and Poland.
Everton midfielder Gibson, who is yet to start the new campaign after damaging a knee in a pre-season friendly against Real Betis in August, has been drafted into the initial party for the clash with Group D leaders Germany at the Aviva Stadium on October 8 and the trip to Warsaw which follows three days later.
Judge, O’Kane and Rooney have all been included in previous squads but have yet to feature for the senior side.
These fixtures will decide the fate of Ireland's qualification hopes after victories over Gibraltar and Georgia earlier this month left them in third place, four points ahead of Scotland and with a chance of claiming at least a play-off berth.
Manager Martin O'Neill said: "After collecting six points from our last two qualifying games, we want to keep the momentum going and continue to push towards sealing qualification from what has proved to be a very difficult group.
"We couldn't have two more difficult games ahead in the shape of world champions Germany at home and in-form Poland in Warsaw."
Gibson has returned to the international fold following a self-imposed exile after falling out with previous manager Giovanni Trapattoni and his most recent appearance for his country came when he started the 1-0 defeat by the Scots in Glasgow last November.
Victory in either match would secure a top-three finish, although with Scotland facing whipping boys Gibraltar in their final fixture, their clash with the Poles in Glasgow the night Ireland entertain the Germans could have a major bearing on the way the group pans out.
Should Gordon Strachan's men win both of their games, even two draws would not be enough for Ireland as the Scots have a better head-to-head record.
However, if Scotland were to lose at home to Poland, Ireland would finish ahead of them regardless of what happened in their own remaining qualifiers.
Republic of Ireland squad: David Forde, Shay Given, Keiren Westwood, Darren Randolph, Rob Elliot; Richard Keogh, Marc Wilson, Seamus Coleman, Cyrus Christie, John O'Shea, Alex Pearce, Shane Duffy, Ciaran Clark, Paul McShane, Stephen Ward, Greg Cunningham, Robbie Brady; James McCarthy, Jeff Hendrick, Darron Gibson, Harry Arter, Eunan O'Kane, Glenn Whelan, Paul Green, Aiden McGeady, James McClean, Alan Judge, Anthony Pilkington, Stephen Quinn, David Meyler; Jonathan Walters, Wes Hoolahan, Robbie Keane, Shane Long, Daryl Murphy, Kevin Doyle, Anthony Stokes, David McGoldrick, Adam Rooney, Simon Cox.
