Young won a penalty, which was missed by Robin van Persie, and former United skipper Roy Keane was scathing in his analysis on ITV.
"Ashley Young has conned the referee," said the Irishman.
However, Moyes adopted a more defensive tone.
"I have seen it and the boy certainly tugs him in the box," said the United boss.
"If you look the referee is two yards away from it and decided to give it.
"All I know is he got a penalty kick from a decision, I don't know anything about reputations or anything.
"The referee was there. He made quite a lot of decisions tonight and that one he gave a penalty kick."
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