Usain Bolt is fast.

But how useful will his speed be on a football pitch?

He is serious about his decision to take up football as a career and following his retirement from athletics, the Jamaican has enough time on his hands.

He is already 31 and may have a short career if he takes up football, but that is less of a worry for the eight-time Olympic gold medalist, currently recovering from a hamstring injury.

Bolt says football has always been his boyhood dream.

“For me it’s a personal goal. I don’t care what people really think about it. I‘m not going to lie to myself.

“I‘m not going to be stupid,” the Jamaican told reporters at the U.S. Formula One Grand Prix.

He was speaking before world champion Lewis Hamilton drove him around the Circuit of the Americas in a Mercedes AMG sportscar, sending the car sliding into corners and ending with tyre-smoking spins.

“If I feel I can’t do it, I‘m going to say ‘you know what, forget this’. I‘m not trying to embarrass myself.

“But if I go out there and feel I can do this then I will give it a try. It’s a dream and another chapter of my life,” said Bolt.

“If you have a dream that you always wanted to do, why not try and see where it will go.”

The world’s fastest man has been sponsored by Puma since he was 15 and the German Sportswear Company has a stake in Borussia Dortmund.

usain Bold and Alex former Manchester United manag

Bolt, who retired from athletics after August’s world championships in London, has been invited to spend a week training with the Bundesliga club and he plans to take it up, Reuters reports.

Also Read: Usain Bolt Set To Play For Manchester United

“It’s just my hamstring keeping me back right now. In two weeks I can start training again and get back into some shape.

“Then I can really explore the situation,” he said.

“They say the invitation is always open, so it’s all about me getting over my injury and then getting into shape.

“Then I can do the trials and see what level I‘m at.”

A keen Manchester United fan, Bolt doubted manager Jose Mourinho would be on the phone any time soon, but said he had spoken to the club’s former manager Alex Ferguson about his dream.

“He said ‘Alright, get into shape and I’ll see where that goes’,” said the sprinter.

Jamaica failed to qualify for next year’s World Cup finals and are currently 59th in the world rankings, leaving Bolt to also muse: “I think I can make the Jamaica team easily. I wouldn’t say they are that good at this point".

READ MORE INTERESTING STORIES FOR FREE. DOWNLOAD BOUNCE NEWS APP HERE

Bolt, who suffered the injury in his final race, the world championships 4 x 100 metres relay final, again ruled out any athletics comeback.

The Olympian said he missed the laughs and banter, but not the training and he wants to start a family.

“I‘m waiting to see if my football career will go anywhere, but I definitely want to work with the IAAF in ways to promote the sport and help keep it on the level on which I left it,” he added.