The goalkeeper was elated after his side's win on Monday night saw them move 11 points clear at the top of Serie A
Two goals from Arturo Vidal saw the Bianconeri move 11 points clear of Napoli at the top of Serie A and leave the reigning champions needing just another seven to seal a second successive crown.
“I will not even pronounce the word championship," Buffon said to reporters after the game.
“(But) I can say that today we have made a big step forward. We had to absorb elimination in the Champions League, which was deserved, but it has still come as a surprise to us.
“There are still seven points to win by the end of the season. If we can achieve this goal, it will be another great accomplishment.”
Buffon was also quick to give credit to Lazio, who sit in sixth spot after the loss and have a fight on their hands to secure European football next season.
He added: “I went to say goodbye to the Lazio fans after the game because they have always shown me great respect. They deserve it.
“Tonight we did well because it is not easy to win at the Olimpico. Lazio is always a tough opponent.”