Last weekend the defending champions lost the Manchester derby to title rivals United, suffering their first Barclays Premier League defeat of the season and first at home for almost two years.
It handed the Red Devils a six-point advantage at the top of the table but Clichy knows that is not insurmountable.
"For me the problem this year is that we are not playing as well as a unit as we did last year and that's what we have to work on," he said.
"I am very confident though because we have the quality and I am sure we are going to be there at the end of the season.
"I personally believe and feel that we have a mission and its aim is to become champions again.
"The feeling within the team is great at the moment and I hope that the fans are behind us because we will need them to go all the way."