The French centre-half was amongst a defensive unit that kept a clean sheet away at Marseille, allowing the Gunners to salute 1-0, and he hinted that it could be the catalyst for many more shutouts to come.
"We have to convince ourselves that we can repeat this kind of defensive performance," he told the club's official website.
"We played as a real unit. We did the job together and defended well as a team. To defend well, it's not only down to the four defenders, it's the whole team.
"We did it well on Wednesday night so I cannot see why we could not do it at every game. We proved in Marseille that we can do it and our keeper didn't really have any big saves to make.
"We knew that if we created spaces behind their defence we would have some good chances and we kept our belief until the end.
"We are top of the group now but there are still a few more games to be played for. But we are on a good run, we have built some momentum and we need to continue."