France scrum half Sebastian Tillous-Borde says Les Bleus intend to follow Italy's lead to exploit a chink in Ireland's armour.
The sides meet in Sunday's Rugby World Cup Pool D decider at Cardiff’s Millennium Stadium – with Ireland slight favourites.
Joe Schmidt’s sides showed signs of vulnerability in the face of an aggressive Italy, who ran them close before succumbing 16-9.
Tillous-Borde said France will mirror the Azzurri's approach but in a more clinical fashion.
"They (Ireland) struggled to play their game. That game against Italy showed that when they are put under pressure, they can be wasteful," said the French number nine.
"It's up to us to do the same thing, but cleaner."
France and Ireland won their first three matches against Italy, Romania and Canada, with Les Bleus showing slight improvement game after game.
"We're out to get top spot in the pool," added Tillous-Borde, who again starts alongside veteran fly half Frederic Michalak.
"Having already qualified takes the pressure off, we'll play a big game this weekend so that we can go into the quarter-finals full of confidence."
Despite any perceived Irish weakness, Tillous-Borde remains wary of Ireland's lethal weapons.
"Johnny Sexton and Conor Murray kick the ball a lot and their wingers are quick to go up the field so they put on a lot of pressure," he said.
"So we will have to be good on high balls, then we will have opportunities.”
