The Tunisian has been at Sevilla since the winter transfer window, where he was hoping to play more often.
However, he has struggled to find his best form and the 21-year-old has barely featured.
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According to Spanish outlet Estadio Deportivo, the player's camp are upset at Sevilla boss Quique Sanchez Flores.
The latter is not impressed by Mejbri either, which appears to put the loan move into question.
United may now find it difficult to get any serious fee for Hannibal in the summer window.