The Gunners have embarked on an extraordinary winning run since losing on the opening day of the new season at home to Aston Villa, and are now two points clear at the top of the table.
While manager Arsene Wenger insists any title talk is premature, he insists the belief is there within the squad to maintain that momentum.
Sagna sees no reason why the players, boosted by the club-record £43million deadline day transfer signing of Mesut Ozil from Real Madrid, cannot keep up their performance levels - which will be tested as the European campaign continues at home to Napoli on Tuesday night.
"At the moment the team is very confident, we are very ambitious and the best way to do that is to win games," the full-back said.
"We have to take it game by game until the end.
"We have the quality to do it and I think we can do it, but we have to stay focused until the end and we have to keep working hard."
Key to Arsenal's progress has been the form of France striker Olivier Giroud, who has netted five goals so far.
Sagna feels his France international colleague is growing in stature.
"He is always questioning himself, knows what he did well and what he did wrong," the defender said.
"Olivier tries to work on it during training sessions and tries to communicate with the boss, is always asking about his positioning, what he could do more.
"He is a very good player, good physically in front of the goal and finishes well,
"We need to give him time and I think he will improve even more, and be more decisive."
Sagna, 30, is out of contract in the summer and as such could open negotiations with another club from January.
Wenger, though, refused to be drawn on the player's future when they sat alongside each other at Monday's pre-match press conference.
"We are always talking about it (contract)," he said.
"When the situation has developed, we will inform you. And there again, I do not think today is the best day to talk (about that)."