LONDON: Usain Bolt says there is no concern about his participation in the World Championships in Beijing next month, after missing two Diamond League meetings with a left leg injury. Bolt, who will race in the 100 meters in the Diamond League meeting at London's Olympic Stadium on Friday, has not competed since running the 200m in New York last month. He withdrew from events in Lausanne in June and Paris earlier in July with the leg injury. Bolt says 'he won't know until tomorrow' how fit he is but added ahead for next month's event in Beijing that 'when the championship comes, if anyone knows anything about me, I will show up.'