The Old Lady lost the Derby d’Italia to Inter.
“We are doing well and are on good form at the moment,” Sissoko told ESPN Soccernet.
“We have got over the defeat against Inter and we are right up there. A six-point gap isn’t much and we believe we can catch up.
“It is a long championship and we are right up there. My personal philosophy is to take each game as it comes and see what happens.
“I don’t believe that teams like Milan, Fiorentina and Lazio are out of the running for the title. That’s why we must continue winning, starting from this Sunday.”