Les Bleus have already booked their place in the last 16 of the competition thanks to two wins from their opening two matches in Group E.
France's 2010 campaign in South Africa was considered a disaster due to disharmony among the players and coaching staff, but Sissoko insists that there is a far more positive mood in the camp this time around.
"Like we told ourselves at the start of the competition, we all share the same goal and the coach knows he can expect the same thing from all 23 members of the squad," he told FIFA.com.
"Everyone is ready to go out on the pitch at any time. I wasn't a starter in the first match and I was in the second, but I prepare myself the same way in both cases – to be ready on the day of the game."
France play their final group game on Wednesday when they face Ecuador in Rio de Janeiro.