LONDON — Whatever controversy is raging in the Olympic world there’s one constant: Usain Bolt’s bravado and self-confidence.

It’s what is expected from the world’s fastest man and greatest showman.

“I know the sport needs me to win – and come out on top,” Bolt asserts, assessing the damage caused by the Russian doping scandal that has divided sports leaders.

As for his pursuit of a treble Olympic next month, Bolt adamantly responds: “I’m not going to lose one of the golds, for sure.”

In his last lengthy media appointment before heading to Rio de Janeiro, Bolt spent around two hours over a Jamaican lunch last week in London, discussing his Olympic challenge prospects and the challenges of life.

Bolt’s preparations for the defense of his Olympic titles (100, 200 and 4×100-meter relay) have been far from smooth, with a hamstring injury forcing him out of the Jamaican trials.

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“I always have little doubts in my mind,” Bolt said. “But I’m focused and ready to go.”

Bolt expects Rio to be his last Olympics, but he still dangles the possibility of a trip to Tokyo.

“My coach always says ‘Usain you can always go on to the 2020 Olympics if you want,'” Bolt said. “So this is why he tells me to stop talking about retirement and just take it a year at a time.”

The power of athletics in attracting big audiences would be more difficult without its global superstar.

“People always say to me, ‘Usain when you leave the sport, the sport is going to go down,'” Bolt said. “But I’m not going to look at it like that. There are a lot of athletes stepping up.”