France captain Hugo Lloris believes the outcome of the Euro 2020 last-16 clash with Switzerland will hinge on the match-day attitude of Les Bleus.
The title favourites have yet to truly hit their stride, narrowly beating Germany but drawing with Portugal and Hungary in the group stage.
They topped Group F but left room for improvement, and will look to show in Monday's clash with the Swiss in Bucharest that their pedigree has not been overstated.
Lloris said in a news conference on Sunday: "We've turned the page from the group stage which demanded a lot of effort. We're entering a new competition.
"In the approach we take, it's completely different. We know that we can't make an error. There will be adversity. We will have a great team playing against us who have achieved beautiful things in recent seasons.
"We know the mental aspect will come into play. This will certainly be key to success. We have to produce a performance of a very, very high level to get through to the next round.
"We can count on our background and experience but that's not enough. We have to put all the necessary ingredients together to succeed.
"This wil mean lots of effort, sacrifices, talent and equally discipline. We have to be prepared to overcome this challenge in a mental sense. All of this as a team. From the start we've lived this adventure with all the players, the technical and medical staff. We want to go as far together as possible."
France have a number of injuries, with Lucas Digne, Jules Kounde and Marcus Thuram all ruled out by head coach Didier Deschamps. Lucas Hernandez could be involved, though, after a knee problem.
Goalkeeper Lloris said: "It's up to us to give the response on the pitch, by putting in the necessary energy, showing discipline and making the efforts to write our history and create success.
"We're a team of competitors, we don't like losing, but especially when you know that you can go home, the challenge is even greater. It's up to us to do what is necessary in our performance to still be there in the next round and to rise to the occasion."
Karim Benzema's two goals in the draw with Portugal were a welcome boost for France, with the recalled Real Madrid striker showing his value.
Benzema and Antoine Griezmann, who scored in the draw with Hungary, are the only France players to score so far at these finals, with a Mats Hummels own goal bringing about the team's opening win over Germany.
There is surely more to come from the likes of Kylian Mbappe, who has had a team-high eight shots at goal and built up an expected goals tally of 1.29, second only to Benzema (1.71).
According to Lloris, there was never any doubt about Benzema's impact on his return, even before he made a goalscoring contribution.
"I think he's been ready, since he was called up, to do what is necessary for the team but also in a personal sense to bring his experience, his background and his talent in order to help the France team," Lloris said.
"Obviously a striker is looking for goals, that builds confidence. We already know his influence on the team's game, we've not needed to wait for him to score these two goals to see it."