Giovanni Trapattoni is ready to re-draw his masterplan on the eve of Euro 2012.
However, the 73-year-old Italian is considering a precise tweak rather than a complete overhaul after seeing his Irish side scrap their way to a 0-0 friendly draw in Hungary in their final warm-up game.
A clearly agitated Trapattoni said: "I have to show the team what happened because it is my duty and we need to change."
Trapattoni was unhappy at the way his team struggled with the Hungarians' 4-2-3-1 formation and repeatedly allowed dangerous midfielder Balazs Dzsudzsak to roam behind lone striker Adam Szalai.
It is understood the manager, who had previously played skipper Robbie Keane in a "number 10" role, intended to review the situation after the game and before Sunday's opening Group C clash with Croatia, but it appears the need has become more urgent.
He added: "We must understand why. I know why, I knew before why, yesterday and the day before.
"When we meet a team with one striker, I know that between two lines, we are in difficulty.
"To have a balance, we have to give up one striker or put one more in midfield.
"In the past, I know this position, I know this line-up. I will speak with the team and I will show them our difficulty because we need to take a decision to sacrifice a striker, or we need to change the situation."
He added: "We need one more in midfield. If you watch, if you see, one more in midfield. It is clear."