With French midfielder Yohan Cabaye having complained of mental fatigue earlier this season, Pardew admits the psychological welfare of players is a growing consideration for managers.
He said: "That's a side of the game where we need to keep our finger on the pulse.
"Certainly, I have had three or four players with disorders at certain times in their career and come through.
"Players do get them, and it's about helping them. Roy Carroll at West Ham sticks in my mind.
"He was another goalkeeper and their trade, more than anyone else, is a little bit different because they are always slightly detached from the unit.
"Obviously, they train separately and they are not working in a unit as such, so they sometimes can go a little bit more down that line."