The former France international became embroiled in controversy when he made the salute after scoring in a 3-3 draw at West Ham in December, and was charged by the FA relating to an "abusive and/or indecent and/or insulting and/or improper" gesture, which "included a reference to ethnic origin and/or race and/or religion or belief".
Anelka, who faces a five-match ban if found guilty, requested a personal hearing after denying he had acted in an "abusive or indecent or insulting or improper" manner.
M'bala M'bala is credited with inventing the gesture, which is interpreted by some as an inverted Nazi salute.
M'bala M'bala leaped to Anelka's defense last month, describing the former Real Madrid man as a "prince" and "a brother in humanity."
West Brom's backing of the striker has led to sponsor Zoopla ending its association with the club, while anti-racism group Kick It Out has previously voiced its frustration at the length of time it took the FA to act on the issue.