The 36-year-old claimed there is a lack of variety in the back-line and that Gunners boss Wenger needs to address the problem by bringing in 'big-time players.'
However, Campbell was quick to leap to the defence of the club's existing defenders, citing they have the talent, but need to find more consistency.
Campbell, who spent five seasons with the Gunners before returning briefly last year, told the Daily Mail: "He's [Wenger] definitely got to get a goalkeeper and get someone in the backline.
"The centre-backs at the club are good footballers. It's just transferring that into consistency, every game demands different things from each player.
"So he [Wenger] might have to add a different type of defender into that area to handle certain games and help out next season. It's good to have a variety at the back because every game throws up different things.
"Sometimes you need big-time players and he might have to go for a couple of older players who are bit savvy in the Premier League and can transfer it to Europe."