No, that's the rules of football, that's how sports work. There might be a possibility to appeal to CAS, but you appear to be under the mistaken impression, that this ban is unprecedented or even unusual in any way, and it simply is not.
If he filed a lawsuit his career would be finished. There's literally nothing the FIFA hates more than being bothered with civil courts, he would never play again.
If he filed a lawsuit his career would be finished. There's literally nothing the FIFA hates more than being bothered with civil courts, he would never play again.