Usain Bolt of Jamaica celebrates winning the gold medal. [Photo/Agencies]

He said he wanted to remain connected to athletics but not as a coach, and was confident that he would walk away with the sport in good shape despite athletics suffering a miserable year of corruption and doping headlines.

"It looks good so far," he said. "I think the younger kids are really stepping up. (Christophe) Lemaitre stepped up tonight, Andre De Grasse has been on the right track," he said of the bronze and silver medallists.

"So I think we're in good shape and the sport has been doing better."