Mazzu was appointed in the offseason after six years at Charleroi. He replaced Philippe Clement, who returned to his former club Club Brugge. Clement has Brugge five points clear at the top of the league, and held Real Madrid to 2-2 at Santiago Bernabeu Stadium in the Champions League.
Genk started its Champions League group losing at Salzburg 6-2, and was beaten twice by Liverpool in recent weeks.
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