Brian O'Driscoll insists Ireland must be able to reflect on their World Cup quarter-final against Wales knowing they gave everything.
The first knockout match of the tournament is shaping up to be a classic with two of the form teams colliding at Wellington Regional Stadium on Saturday.
“This game is huge because of the stage we're at. It's knockout rugby. Personally it will be the last quarter-final I'll be in,” said the 32-year-old Leinster centre.
“It's win or go home. Once you have that mentality you must make sure you produce on every occasion you pull on a jersey in this from now on.
“Otherwise someone else will reach the next round and we'll be the ones going home with the what-ifs.”
Rain has been forecast for Wellington on Saturday and this will suit neither side, though Wales' high-octane back line is likely to suffer more.
O'Driscoll said: “You do what gets you across the line and wins games for you. It's about playing pressure rugby, not necessarily about deciding one type of brand to play before the game.
“You must feel your way into matches and understand what it takes to build that pressure and turn it into points. It's about what it takes to win on the day.”