Northern Ireland boss Michael O'Neill maintains his players still believe they can reach Russia and will not dwell on the infamous penalty decision.
After a scoreless draw in Denmark, Martin O'Neill expects Ireland to need two goals at home to reach the World Cup.
Gareth McAuley will contemplate international retirement if Northern Ireland fail to beat Switzerland in their World Cup playoff.
Martin O'Neill has warned the Republic of Ireland they may have to score twice to beat Denmark to a place at the World Cup finals in Russia.
Denmark and Ireland head to the second leg of their World Cup playoff scoreless after some crucial saves.
Denmark goalkeeper Kasper Schmeichel described the Parken Stadium pitch as "horrendous" after the Republic of Ireland secured a 0-0 draw.