Representing nation

[Geordieboy52]

I've managed a fair few nations this time round and one of the things I have seen is that it is impossible to get a play to commit to an international call up to the country I am managing and I don't know if it is a bug or not.  At the minute I am playing as Nigeria and even those newgens who have Nigeria as their main nationality are rejecting call ups; also players who are in the 28-31 bracket who have never been near their national team at any point are rejecting call ups even though we're currently 15th in the world rankings.  Has anyone else noticed this or am I just getting lost in the minutae?