Martin O'Neill has a simple message for his players in advance of a massive night at the Aviva: "No holding back. Give it everything you've got."
Aware that Ireland's away goal advantage won after a tough battle in the fog in Zenica can disappear in an eyeblink he will set out with a mindset which demands a win.
"We have to put things into perspective: Bosnia are capable of scoring, they could wipe that advantage, that away goal that we have, within minutes of the game, and then suddenly they are on the front foot.
"If we think that we can keep them out for 90 minutes and camp ourselves just outside our own penalty area, that would be a recipe for disaster.
"We have to consider being really on the front foot, genuinely, and going and trying to win this game, and that's it," he said.
"This is about the Republic of Ireland winning one more game to go to France. It would be terrific if we could do it and I can't put it any more simply than that."