Januzaj was born in the Belgian capital of Brussels to Kosovan-Albanian parents and joined United in 2011, he qualified for Albania and Kosova through his parents but Manchester United winger has decided to represent Belgium in international football.
Belgium coach Marc Wilmots made the announcement on Twitter and said he was “delighted” by the player’s decision.
The 19-year-old could have played for Kosovo, Albania, Turkey, and potentially, England, but could now make Belgium’s World Cup squad.
He has yet to play international football at any level, but was invited to play for Kosovo in a friendly in March.
Signed by United from Anderlecht for a reported fee of £297,000, Januzaj could have played for England from 2018 assuming he remained in the country.
Fifa rules state a player is eligible if “he has lived continuously for at least five years after reaching the age of 18 on the territory of the relevant association”.
Januzaj made his league debut for United as a substitute in a 2-0 win at home to Crystal Palace in September and scored both goals for the defending Premier League champions in his first start, a 2-1 victory at Sunderland, on 5 October, 2013.
Following Januzaj’s goalscoring full debut, Wilmots said he wanted him to play for Belgium, while England manager Roy Hodgson admitted he had been keeping an eye on a player whom he described as a “real talent”.