Usain Bolt has revealed that he is set to return to Borussia Dortmund for three weeks as he continues his bid to become a professional footballer.
The Jamaican sprint legend had a two-day stint with the Bundesliga giants last month, although head coach Peter Stoger suggested he was not yet ready for the top level.
But Bolt insists a football career is no joke to him and he is determined to improve, with a second spell at Dortmund helping him to assess his progress.
"I'm actually going back to Dortmund in a couple of weeks, to work with them for three more weeks. I need to assess myself at a better level to see what level I'm at, what I need to do and if I can. That's something I'm focused on.
"I'm looking forward to the challenge, because that's what I want - I want a new challenge in life."
Asked whether he can make the necessary adaptations to succeed in football, the eight-time Olympic champion replied: "It's a little bit more technical, but I've shown in my life that I've always adapted myself.
"With soccer, I played in high school a little bit - even while I was running, I played with my friends. The first trial I went to, they were very impressed. They didn't expect me to know so much, to understand the game.
"It's all about improving right now. I personally think I can do it. I'm a hard worker and I'm determined."
And Bolt says this is his sole focus now, ruling out any return to the track for the 2020 Olympic Games in Tokyo.
"For me, I have already accomplished what I can when it comes to track and field," he said.
"I'm trying to move on to another goal, to soccer. I'm trying to do something else."