The Republic will pay attention to the result of the opposite group sport involving Armenia and Hungary earlier than they kick off towards Portugal.
“It's going to have a significance however by way of how we'll strategy the sport I do not suppose it can have an excessive amount of initially,” defined O'Shea.
“We have now to give attention to what we have now to do towards Portugal and to get that end result that we want.
“They [the crowd] have an enormous impact on how we carry out and the power they may give us, however we have now to assist them with that, we have now to present them one thing to cheer about. It really works each methods. Once we're each pulling the identical course we're onerous to cease.”
O'Shea described Thursday's encounter with one in every of Europe's heavyweights as “an enormous sport”.
“We have now to be tight, we have now to be aggressive, clearing crosses, the standard stuff.
“It is a World Cup qualification sport at house towards a high seed.
“It is why we do it. It is why you are in soccer for these situations, to be dealing with opposition, but additionally to know you will be a part of a unbelievable victory to your nation. In order that's the important thing bit behind it and it is why we do it, it is why we find it irresistible.”
Jamie McGrath has additionally been known as up by Hallgrimsson for the upcoming matches.
Hibernian midfielder McGrath is a alternative for Bristol Metropolis's Mark Sykes who sustained a gash on his leg throughout final week's 1-0 defeat by Blackburn Rovers.
McGrath gained his final cap in its place in a 2-1 away win towards Finland in October 2024.
Up to date Republic of Eire squad
Goalkeepers: Caoimhín Kelleher (Brentford), Gavin Bazunu (Southampton), Mark Travers (Everton)
Defenders: Seamus Coleman (Everton), Jake O'Brien (Everton), Dara O'Shea (Ipswich City), Nathan Collins (Brentford), Liam Scales (Celtic), John Egan (Hull Metropolis), Ryan Manning (Southampton), Jimmy Dunne (Queens Park Rangers), Kevin O'Toole (New York Metropolis)
Midfielders: Josh Cullen (Burnley), Jack Taylor (Ipswich City), Jayson Molumby (West Bromwich Albion), Finn Azaz (Southampton), Conor Coventry (Charlton Athletic), Jamie McGrath (Hibernian), Andrew Moran (Los Angeles FC)
Attackers: Troy Parrott (AZ Alkmaar), Adam Idah (Swansea Metropolis), Mikey Johnston (West Bromwich Albion), Chiedozie Ogbene (Sheffield United), Festy Ebosele (Istanbul Basaksehir), Johnny Kenny (Celtic).
