The youngster will join Barca at the end of this season.
Suker, now Croatian FA president, said: "I cannot talk about it, now I am president, anything you say is 'read into' in my country because it is very close to the World Cup.
"So there is controversy about whether or not Halilovic should go to Brazil.
"Although it would be a wise move if Barca signed Alen Halilovic. He is an interesting prospect."
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