I will not comeback. This is the end: Usain Bolt

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London, August 14: Sprint king Usain Bolt said there would not be any coming back for him to the track.

"It's really sad that I have to walk away now," said the Jamaican. "I was saying goodbye to the fans and saying goodbye to my events also. I've seen too many people retire and come back just to make it worse or to shame themselves. I won't be one of those people," he said.

Bolt could only manage a bronze in his penultimate race - the men's 100m - before pulling up injured just as he began to hit top speed in his final event, the 4x100m relay, on Saturday (August 11).

It meant the 19-time global champion, recently described by Lord Coe as "a genius" akin to boxing legend Muhammad Ali, bowed out in unfamiliar fashion - helped off the track by his teammates, barely able to stand upright.

"For me, I don't think one championship is going to change what I've done," he added. "I remember after losing the 100m, someone said to me, 'Usain, no worries, Muhammad Ali lost his last fight also, so don't be stressed about that'.

"I've proven myself year in, year out, throughout my whole career. I was saying goodbye to everything. I almost cried. It was close, but it didn't come."