Fifa's nationality rules
Footballers who have played a competitive international for one team cannot switch to another national side.
But this rule has been relaxed to allow footballers to change nationality from junior to senior level.
Friendlies are not binding - so Diego Costa was able to switch to Spain after playing friendlies for Brazil, as did Belgium's Nacer Chadli after a Morocco friendly.
Players with no blood connection to a country are only allowed to represent it if they have lived and played there for five years.
But this is different for refugees, who can play upon receiving citizenship without having to wait to wait five years.
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