Former Tottenham Hotspur and Arsenal centre-back Sol Campbell has said the key to the Gunners winning Sunday's North London derby will be dealing with the pressing game played by Spurs.
Campbell, who switched from Tottenham to their biggest rivals in 2001 and won two league titles under Arsene Wenger, said he expected the game to be decided in the last 20 minutes.
And the former England international told 888sport that Arsenal must cope with Tottenham's energy levels until then.
"Arsenal will be geared up for Spurs' pressing because you cannot do that relentlessly all of the time, only five or 10 minute spells," he said.
"They will be concentrating on how to get past the second press and that's where you open them up.
"That's why the last 20 minutes will be key, because a side that has pressed will have spent up a lot of their energy."
In recent years, Wenger has been accused of neglecting the defensive side -- but Campbell said he believed Arsenal have found a better balance after bringing in Shkodran Mustafi to form a centre-back pairing with Laurent Koscielny.
"I like the mentality between them. They have the right guys in there now who have the willingness to defend and that is key," he said.
"They're mobile but calm -- they can pass the ball around the back, pick the right ball or find row Z if needed. There is a nice balance between those guys."
Tottenham are undefeated this season but three points behind Arsenal, who are level on points with Manchester City and Liverpool at the top.
Campbell rejected the theory that the Gunners do not have the mental strength to win the league, saying: "It's not mentality, it's just injuries.
"That's what has hurt them all these years -- key injuries to key players in key moments. If they can keep a fit team, they can go all the way."