Usain Bolt hopes SAF could sign him to replace Ryan Giggs. Serious!

Jamaican sprint champ Usain Bolt wants trials with Manchester United.

The Olympic gold medalist has already trained with German team Bayern Munich but United are his preferred choice.

Bolt, 24, who won three gold medals at the Beijing Olympics in 2008, says in his autobiography: "Ideally, if I was to play football, I'd sign for my favourite team --Manchester United. People say it's not realistic but nobody has seen me play so you never know.

"If Alex Ferguson saw me in one of those charity matches he might think I could replace Ryan Giggs."