The eight-time Olympic gold medallist, who retired from athletics in August last year, is to train with the Bundesliga side in March.
But the 31-year-old still retains the hope of playing for the club he cherishes and says he has spoken to Sir Alex Ferguson about a move.
“In March we’re going to do a trials with Dortmund and that will determine what I do with that career, which way it goes,” he told the Daily Express.
“If they say I’m good, and that I need a bit of training, I’ll do it.
“It makes me nervous. I don’t get nervous but this is different – this is football now.
“It’ll take time to adjust but once I play a few times I’ll get used to it. It was the same when I started track and field. I was nervous for a while until I started getting used to the crowd, people and everyone around and it falls into place.
Bolt is adamant he has what it takes to become a Premier League footballer despite having no professional experience in the game.
He added: “I watch a lot of football, I understand it, I play it. With training, I could be good. Me and [Paul] Pogba talk a lot. I watch and ask him a lot of questions. I want to play but it has to be in the top league. I’m not content to be average.
“I strive to be the best and if I get a chance to play for a team like Manchester United it will be a massive deal.”