Zaha signed on loan with boyhood club Palace in August and completed a permanent return to Selhurst Park in the January transfer window.
The 22-year-old, who wowed audiences during his first spell with the London club, never truly hit the heights expected of him following his transfer to the Red Devils. A lack of game time did not help but the twice-capped England international never truly did enough to warrant a first-team role.
Since returning to Selhurst Park at the beginning of this season, Zaha has made 26 appearances but has only played a bit-part role. Just 15 Premier League starts has hardly been the return many would have expected from the youngster, although since the appointment of Pardew, the youngster has been enjoying something of a rejuvenation.
Most recently, as the Eagles defeated Queens Park Rangers 3-1 at home, Zaha started and both scored and created a goal during a top-class performance.
One would expect the winger to continually improve back at the club with whom he broke through and Pardew believes there is just one more issue Zaha must overcome before finding his best form for the Eagles.
Speaking to reporters, the former Newcastle boss said: “I don’t see him smile enough. He takes everything like a massive disappointment, that is a player who has been damaged.
“What I mean by that is if he doesn’t get the pass, he might have a little sulk, just for a few seconds, but that is enough time for something to happen in the Premier League.
“He does it in training too. I am saying it publicly because I think it is important that he understands he needs to get rid of it.”