The midfielder went down in the area during the second half of the London club's 2-1 victory at the Britannia Stadium and was booked for simulation by referee Andre Marriner.
Palace boss Pardew gave a frank assessment of an incident which he stated was out of character from the Scotland international.
He said on Sky Sports: "He dived. He should be embarrassed. He's a great professional and that's unlike him. I was surprised but it shows what pressure does to players.
"I haven't spoken to him about it but I don't need to. He will see the replay and he will be embarrassed."
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