Young Belgian Philippe Gilbert (Francaise des Jeux) will miss the Amstel Gold Race this Sunday, and next week's Ardennes classics are also in doubt, according to a report in Het Nieuwsblad. Blood tests have revealed that Gilbert is suffering from general fatigue, the exact cause of which is unknown. "Further tests should hopefully show what it is," said Gilbert. "The results are expected by Tuesday. At the moment, I don't think it will be good for the Ardennes classics, but maybe it can improve."