The play Portugal in the Aviva Stadium tomorrow.
Republic of Ireland defender Dara O'Shea feels tomorrow's World Cup qualifier against Portugal is a 'huge opportunity' for the team.
Heimir Hallgrimsson's side need a positive result at the Aviva Stadium in order to set up a must-win clash with Hungary in Budapest on Sunday.
O'Shea says they believe they can turn over the Nations League champions:

Tuesday Morning Sports Update
All Ireland Football Championship Opening Round Fixtures Confirmed
Tommy O'Brien Among Injury Doubts For Leinster's Champion Cup Final On Saturday
Monday Morning Sports Update
Sunday Evening Sports Update
Mourinho's Benefica Go Unbeaten but Miss Title
Brave Kildare Fall Short in Leinster Ladies Final
Chelsea Appoint Xabi Alonso as New Manager