“No, no, no,” Bolt said on Wednesday, a day before the race in the eastern city of Ostrava.
The 100 and 200 Olympic and world champion said 300 was not new for him because it's a common part of his training.
“I know how to run 300 meters, that's why I decided to run a race and see how fast I can go in a competition,” Bolt said. “I'm looking forward to it.” Bolt said he didn't plan to compete in the 300 regularly.
Meantime, Caster Semenya’s return to racing has been put on hold after an international track meet in Spain was canceled because of a budget shortfall.
Semenya, the South African runner who is awaiting the results of a gender verification test, was expected to race June 24 in Zaragoza. It would have been her first competition since wining the women’s 800-meter world title in Berlin last August.
The 19-year-old Semenya was in Ivory Coast on Wednesday and said she was not aware the Zaragoza meet had been called off and had no immediate plans for her return. She is in the west African country to receive an award from the Sports Action group, which promotes athletics for young people.
The International Association of Athletics Federations has said the Semenya case would be resolved by the end of June.
The Zaragoza meet had been in financial difficulties in past years, with the Spanish athletics federation saying there was no chance of the meet returning this year.