Arsenal boss Arsene Wenger believes the Gunners are now mentally prepared to beat Chelsea in the Premier League.
The Frenchman registered his first personal win over Chelsea boss Jose Mourinho after Arsenal won the FA Community Shield at the start of August.
And he believes there is no longer a mental block preventing his players from succeeding against the Blues.
"For me, what is important is that Arsenal win games," Wenger told reporters on Friday morning.
"It can sometimes be a mental block for the players or the team when they do not win against certain teams. On that front it was good [to win the Community Shield].
"What you expect from these kinds of games is [that they are] always high intensity, full commitment and of course you want to prepare for that and play with a full focus.
"For us it's a big game. Let's not forget it's the start of the season and only five games have been played. We know our position at the end of the season will depend on how well we do in the big games.
"I do not think too much about where Chelsea stand in the league at the moment. I focus more on us performing well, with full power."