The fastest man on the planet Usain Bolt takes seriously the challenge of football. The Jamaican, who yesterday made a training with Borussia (Dortmund), still wants to try his luck one day at Manchester United. Bolt, 31, told the BBC that he even talked to Jose Mourinho for his eventual transfer to his beloved club. I spoke to Mourinho, I did not press him. He told me I was doing well on a small field, but he would like to see me in a bigger field. I`m going to try to send his cadres with Borussia (Dortmund) by email, `Bolt said in half-tone.