The 31-year-old was found not guilty of racially abusing Ferdinand at Westminster Magistrates Court in July, but will still be subject to scrutiny from an FA panel.
The lesser burden of proof required by the panel mean they must only prove Terry used racist language on the "balance of probabilities" rather than the "beyond reasonable doubt" measure used by a court of law.
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"Nobody thinks that John Terry is a racist, so the FA need to leave it," Grant told BBC Radio 5 Live. "John likes to fight and he's very passionate about the national team so I was surprised.
"But he's not a child, he knows what he's doing. One thing I must say about JT is that he's not a racist, that's for sure. He's a good man.
"He respects everybody, he's good with people and I was very surprised that people thought bad things about him."
Whilst Grant believes it is important for the FA to send a clear message that racism is unacceptable in football, the Israeli manager also insisted they have no case against the former England captain.
"If [the FA] think JT is racist they need to do something but I think nobody thinks he is a guy like this," he continued.
"I think the message was clear and I don't think they need to charge him. For the FA, the more important thing is the message that it will not have racism in sport."