World indoor triple jump champion Teddy Tamgho is out of next month's World Athletics Championships.
The 22-year-old Frenchman fractured his ankle last Saturday in Ostrava.
Tamgho's leap of 17.98m last year in New York is the third longest in history.
Great Britain's Phillips Idowu will be defending his world title at the Championships, which start on 27 August in Daegu, South Korea.
Tamgho would have been among the favourites for the gold medal, having won the European indoor title in his home city of Paris in March.
He set a new indoor world record with his jump of 17.92m.
The Frenchman sustained the injury during the warm-up at the European Under-23 Championships in the Czech Republic.
At the time he said: "It hurts a lot. It looks serious but I hope the season is not over for me."
Tamgho set the leading distance in the triple jump in 2011, with a leap of 17.91m in Lausanne in June.
He was due to participate at the Diamond League meeting in Monaco on Friday, where he would have faced Idowu.
Tamgho finished 11th at the last outdoor world championships in Berlin in 2009, an event Idowu won with a jump of 17.73m.