Djhone set a new national indoor record in the 400 m with a run of 45.85 seconds at the 2010 French Athletics Championships, taking 17 hundredths of a second off Stéphane Diagana's 18-year-old mark. In 2011, he won the 400 m (in a new national indoor record time of 45.54 seconds) and the 4 × 400 m relay gold medals at the 2011 European Indoor Championships.