The pair worked together at Newcastle.
Speaking on the latest episode of A Pint with Eamonn Holmes and the Gaffers, Pardew said: "There are times with Joey, as you've seen, where he loses the plot; he can lose the plot over a dog having a wee up a tree, it doesn't take a lot.
"Numerous times I took him off the training ground and made him stand with me and he was going mad and I'd think he was going to attack me from the back but he never did, calmed down and I put him back on the training ground.
"Joey's self-confidence, if you actually asked him on a lie detector, 'where would you put yourself on a list of the best players of all time', he'd probably put himself about sixth."
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