The 24-year-old was beaten for the first time in 2 years over 100m by Tyson Gay last August, but has claimed his performance was due to a back problem.
Despite the Jamaican’s accolades, his fellow countryman believes he will struggle to dominate this year.
"It's hard to get everything flowing, he's had problems getting his rhythm back," Powell told BBC Sportsworld.
"I know how to come back from injuries and I'm better technically."
Powell is currently the fastest man in the world after coming in at 9.78 seconds on June 30 in Laussanne.
The 28-year-old, who has won bronze twice at the World Championships, has admitted that he will give everything to better his chances in Daegu, South Korea.
“[I want to] make sure I achieve what I feel like I deserve,” he added. “"I'm not going to waste my chance again.”
The Jamaican will compete in the Grand Prix at Crystal Palace on Friday before heading off to the World Championships on August 27.