Arsenal's security around the dug-out at the Emirates Stadium has been highlighted again after Tottenham staff reported the behaviour of a fan to stewards.

The Spurs bench were unhappy with the language used by a supporter during their 3-0 defeat to Arsene Wenger's men, while Manchester United boss Sir Alex Ferguson has previously criticised the design of the stadium for being too open.

Ferguson famously suggested "you need tin helmets" at Arsenal because there is not enough protection for visiting substitutes and staff.

Spurs boss Harry Redknapp said: "He was swearing and there were little kids standing there. I don't understand why people do that. I just asked if he could behave himself and act like a proper human being."

Redknapp's men were undone by Robin van Persie's opener and Cesc Fabregas scoring straight from the following kick-off.

"We committed suicide really and it cost us," Redknapp said. "It was Sunday-morning stuff, you see that play on the park. All three goals were scandalous."

Redknapp is still confident about his side's ability to sustain a top-four challenge, adding: "There is no gap between the clubs in my opinion. I think two mistakes turned the game upside down.

"We've got 19 points and we'll still be right up there at the end of the season."

He added: "I still feel we can get in the Champions League. When (Luka) Modric's fit, (Aaron) Lennon's fit and (Jermain) Defoe's back, I think we have a terrific team.

"People will question it and that is good. It's up to them to do that. It's nice to prove people wrong in life if you can. I wouldn't give up on the Champions League. It's not impossible. We're talking about a couple of points."

Centre-back Sebastien Bassong, meanwhile, expects the hamstring injury he picked up during the match to keep him out for at least a month.

"I might be out for four or five weeks," he said.