"You have got to get to the stage where teams are frightened of you. You need options and they could do with a few more players who could frighten other teams with their playing ability," said the former Gunners defender, speaking at an Independent Arsenal Supporters' Association question-and-answer session to help promote his new book, Sol Campbell - The Authorised Biography.
"It will turn, but you need that cutting edge in your side. The board might have to put their head on the block and go for it and do not be scared.
"If you spend money on a player and it does not work, you have to go again.
"Yes you can get players through scouting around the world, but ultimately these players are ready made and you have got to play top dollar to get them in.
"Arsenal need some more players who are ready-made and world-class. With everyone fit, I think they need another three players."
"They could be in a situation like Liverpool, who have not had many injuries."
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