Usain Bolt vows not to "embarrass himself" as he aims to become professional footballer

The eight-time Olympic gold medallist retired from athletics in the summer and now wants to make the tough switch to professional football in 2018.

The 31-year-old is an avid Manchester United fan and has reportedly been offered the opportunity to trial with Bundesliga club Borussia Dortmund (Erm, yeah: good luck with that – Ed.).

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