DOHA, Sept. 26 -- China's top sprinter Su Bingtian is cautious about his prospects at the Doha Athletics World Championships as he is still feeling his way back to top form after injury sidelined him for more than two months this season.

Su had his first training session at the host venue, the Khalifa International Stadium, on Wednesday evening to prepare for the first round of the men's 100m on Friday when the World Championships kicks off.

"This season I was not as good as last year. I keep reminding myself to pay attention to every detail because now I feel like just coming back to compete," said the 30-year-old, whose recurrent back injury sidelined him for more than two months, only returning to compete in the national trials in early August.

Su ran 10.05 seconds at the national trials in Shenyang, quite some distance from his personal best and the Asian record of 9.91 that he twice reached last year.

"I wasn't like the man last year. I need to be at least 90 percent or even full strength in the first round to see what level I am now," he continued.

However, Su is assured that he has fully recovered and looks forward to the competition.

"My back injury has been healed. After I trained here today, I felt good. Now I will wait to see how far my ability can carry me," he said.

Su's American coach Randall Huntington shared the same view with his protege.

"It has been a tough summer. We had to work through some nagging things that really caused problems but we worked through those," said Huntington, former coach of long jump world record holder Mike Powell.

"We also had some technical changes which are difficult for anybody to adapt to, so he is the process of adapting still. My goal is hopefully he can make the final and once in the final to see what it is," he said.

Su fought through to the final at London World Championships two years ago and finished eighth in 10.27s there. In Doha, both Su and Huntington agreed that the World Championships are important but their eventual focus will be on next year's Tokyo Olympic Games.

"The World Championships can be seen as a test for next years' Tokyo Olympics for all the athletes," said Su.

Huntington said Tokyo is their big goal.

"This is a really important stepping stone to Tokyo, so we don't want to undermine it because it is huge. But at the same time, it is a vital step to Tokyo for him. We want to keep that big goal in mind while we do these small steps along the way," said Huntington.

The men's 100m field is quite open as Su and his teammate, 200m Asian record holder Xie Zhenye will face tough races ahead.

American Christian Coleman, London silver medalist ran under 9.90s in three races early in the season, while 22-year-old Nigerian Divine Oduduru also demonstrated his potential with the NCAA 100m title in 9.86s and the 200m crown in 19.73.

The medal hopefuls also include reigning African champion Akani Simbine of South Africa, Zharnel Hughes, the British European champion as well as defending champion Justin Gatlin, 37.