If Januzaj opts to play for Belgium, he has an outside chance of forcing his way into their World Cup squad for Brazil 2014.
But Moyes, who quipped, "I think Januzaj has said he has picked Scotland!" is happy for the player to take his time deciding.
"For me, I am quite happy, because it means we have him longer and he is not away," said Moyes.
"We can influence him while he is here. But I am sure he will make his own decision."
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