Usain Bolt admitted thet he will have little chance of winning another world championship title unless he sorts out his lethargic start after storming to victory at the London Diamond League on Friday.
The Jamaican insisted "there was still room for improvement" despite approaching his explosive best while winning the 10w0m at the Olympic Stadium.
The fastest man on the planet, and athletics' greatest entertainer, gave his rivals a decent start before dashing to victory in 9.85 seconds, his season's best.
It is not the first time the Olympic champion and world record holder has been tardy off the blocks and not the first time he has showed the speed and power to burst through the field and win.
Bolt returned to the scene of his heroics in London 2012 and the 60,000 crowd roared him on as he beat off America's Michael Rodgers (9.98) and compatriot Nesta Carter (9.99).
Afterwards he did a lap of honour in front of a frenzied crowd, knelt down to kiss the track in his traditional style and then threw his spikes to a lucky punter before shooting off into the night.
Need for improvement
But Bolt admits he needs to put things right quickly before next month's world championships in Moscow.
"If I start like that in the worlds I will probably finish fifth. I need to work with my coach and figure out how to be more explosive out of the blocks," said Bolt.
"But my coach tells me I am not a good starter anyway and just to focus on my running. I know what mistakes I made in the last world championships and executed the start very well in the Olympics.
"I'm not worried because my mindset is always different and better come major championships."
Return to London
Asked whether he will return to London to run again, Bolt, who only agreed to take up his estimated £500,000 (Rs 4.5 crore approx) fee when a tax deal was agreed with the British government, joked: "That depends on the tax situation.