Usain Bolt has insisted this year's Olympic Games in Rio de Janeiro will definitely be his last.

Bolt will head to Brazil in August seeking an unprecedented 'triple triple' having claimed gold in the 100 metres, 200m and 4x100m relay in 2008 and 2012.

The Jamaican had previously hinted he could continue on to the 2020 Games in Tokyo, revealing that coach Glen Mills had indicated his fitness would be good enough for him to compete in a fourth Olympics.

But the 100m and 200m world record holder told SID: "It'll definitely be my last Olympics. It's going to be hard to go four more years for me, to keep the motivation that I want, especially if I accomplish what I want to in Rio.

"It's going to be hard to keep the motivation to go on for four more years, so it'll definitely be my last one."

Aside from adding another three golds to his tally, the 29-year-old - who has been adamant he will retire following the 2017 World Championships in London - is determined to break the 19-second barrier in the 200m.

"My biggest dream at the Olympics is to win three gold medals again. That's my focus, that's what I want. And that's what I'm aiming for because that's my goal and that's my dream," he said.

"I've said the only big thing, big time I want to run is the 200 metres.

"I'd love to try to go sub-19. That's the only thing I would really, really want because that's one of my goals.

"I've always talked about and always wanted it so for me, that's something I look forward to."