Usain Bolt insists he has no concerns about his fitness ahead of next month's World Championships in Beijing.
The world's fastest man races for the first time in almost six weeks over 100 metres at the Sainsbury's Anniversary Games at the Olympic Stadium on Friday night.
The Jamaican has been hampered by a pelvic injury this summer and the race is likely to prove a very good indication of what sort of shape he will be in for the global showpiece.
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He is 62nd in the world rankings in the 100m with a best of 10.12 seconds, set in April in what was little more than an early-season race designed to blow away the cobwebs.
Two-time drug cheat Justin Gatlin, in contrast, has run under 9.8secs four times this year, extending his unbeaten run to 23 races and establishing himself as the strong favourite for the world title.
Bolt's 2015 200m best of 20.13s is also pedestrian by his standards, while Gatlin has the four fastest times of the year and tops the world list with 19.57.
But the six-time Olympic champion banished any suggestion of only doing one event in Beijing and added: "If my coach (Glen Mills) isn't worried, I'm never worried, he's confident that I can be ready.
"I'm confident, I've been doing good in training.
"I'm not worried about times."
The prospect of unrepentant two-time doper Gatlin winning the blue-riband event in Beijing - or even completing a sprint double - is one which many within the sport find hard to stomach.
At the age of 33 he is running faster than ever, with a new personal best of 9.74 set in May.
Gatlin is not in London - given his past he did not receive an invitation - but Bolt reckons he can come out on top when they do clash in Beijing.
"I look forward to competition. Beijing is a month away, I am not really worried about that, I try and take it a step at at time."
"I've been training really hard, I've been pushing myself. It's all execution now, if I can execute right, get everything right, then I know I'll run fast."