Any Player who ... [assumes] a new nationality and who has not played
international football [in a match ... in an official competition of any
category or any type of football for one Association] shall be eligible to
play for the new representative team only if he fulfills one of the
following conditions:
(a) He was born on the territory of the relevant Association;
(b) His biological mother or biological father was born on the territory
of the relevant Association;
(c) His grandmother or grandfather was born on the territory of the
relevant Association;
(d) He has lived continuously for at least five years after reaching the
age of 18 on the territory of the relevant Association.
— FIFA.com
5、没有为其他协会参加过国际A级比赛 这个是必须的， 不满足这一条，其他都没用。
