Gary Neville believes Arsenal must target defenders with a higher level of concentration in the summer transfer window.
The Gunners' defensive problems have been highlighted in their two defeats in the space of three days, after they followed up their 3-0 defeat to Manchester City with a last gasp 2-1 loss to Brighton on Saturday.
And former Manchester United defender Neville says Arsenal boss Mikel Arteta must follow the advice of Sir Alex Ferguson, who he says would always try to get his defenders to play without any emotion in order to prevent them from making reckless mistakes.
"They just need defenders with better concentration," Neville said on his Sky Sports podcast.
"There were elements of me that were emotional when I was a player Sir Alex Ferguson would knock it right out of me.
"He always said I hate emotional defenders. He thought defenders have to be ice-cold.
"You are gonna make mistakes as a goalkeeper and a defender. But it's the second mistake where you try to win it back and you give away a penalty. It's where you try and win it and you can't win it.
"You've got to put away your ego when you're a defender.
"Delaying helps because your team-mates come back. You get too many defenders who try and win the first ball and try to dive in, and we've seen that with Arsenal's defenders over the years.
"David Luiz, [Shkodran] Mustafi, Sokratis [Papastathopoulos] when he plays, they like to challenge when they don't have to challenge.
"They feel like they have to win the ball, and sometimes it isn't there to win."
