Sagna: Arsenal will be wiser this season
"We will try to be wiser," said the Frenchman. "We need to show people we are still the Gunners and can win the title."
"Everything changes, players have to play in what is not their right positions and it is really difficult when you have to change things."
The France international, however, insists that things can only get better.
He said: "I am very happy because until now I have not been playing for five months. So it is great to be back here with all my mates.
"We have been getting better and better. We are playing quite well at the moment and have won against a top team like Real (Madrid).
"We showed everyone we can still play well, even if we have lost some players.
"Now we have to win the title. We play to win everything and we will try to do it."