The Fiorentina midfielder, 20, received the ban after explaining to coach Sinisa Mihajlovic that he would not sing the anthem out of principle and did not plan on changing his position, the federation said.

The federation insisted this contravened a "point of agreement" that Ljajic had signed in order to make him eligible for selection for the national team. However, the door to the team was not closed, and Ljajic will be invited back should he promise to join in with the singing in the future, the federation said.