Rule 21
a. A National Team participating in a Competition of FIBA may have only one player on its team who has acquired the legal nationality of that country by naturalization or by any other means after having reached the age of 16. This provision applies also to any player having the right to acquire a second nationality at birth but who did not lay claim to this right until after having reached the age of 16.
b. For purposes of letter A above and in the event of doubts, any player claiming to have acquired a legal nationality before having reached the age of 16 without presenting the respective passports with a date of issue before the player's 16th birthday, requires a decision by the Secretary-General confirming that he does not fall under the restriction of letter A above. In taking this decision the Secretary-General shall take into account the following criteria: