Djhone won the 400 metres gold medal at the 2011 European Indoor Championships and the 400 metres bronze medal at the 2006 European Championships. In the final of the 400m event, he finished 4th at the 2003 World Championships, 5th at the 2007 World Championships, 8th at the 2009 World Championships, 7th at the 2004 Olympics and 5th at the 2008 Olympics.