I'm actually wrong. FIFA's rules require an association to submit details of its disciplinary actions to the player's new FA and they must in turn enforce the ban.
"Article 12: Any disciplinary suspension imposed on a player prior to a transfer
must be enforced or applied by the new association at which the
player is registered. The former association is obliged to notify the new
association of any sanction in writing and upon issuing the ITC."
http://www.fifa.com/mm/document/affe..._en_122007.pdf