N'Gog has been widely criticised after appearing to win a cheap penalty against the Blues which Steven Gerrard converted to earn the struggling Reds a point.
Birmingham midfielder Lee Carsley accused the French youngster of cheating, but agent Bruno Satin has leapt to the defence of his client.
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"He wouldn't try and con the ref," he told The Sun.
"He's a lad with very good education, correct and polite. He doesn't look for these things. He's never had a problem of this type before in his career.
"Maybe he fell down because he was worried about being injured? At times players make very hard challenges in England. They allow a lot of things to defenders in the Premier League. At times it's really on the limit.
"Sometimes there are challenges that can assassinate you. A defender could get five matches for throwing his shirt and the player who broke the leg of Eduardo only had a three-game suspension.
"Did the defender put the safety of the player in danger? You have to look at things in a more reasonable proportion."