Olympic and world sprint champion Usain Bolt will fly to London and support Manchester United in the Champions League final against Barcelona at Wembley today.

"It's a pretty easy question to ask who I'll be supporting," Bolt told a news conference on Tuesday before the Golden Gala Diamond League meeting.

"Everybody knows I'm a Manchester United fan. I think the score's going to be 2-1 to United."

According to some Italian journalists, Bolt, sporting a blue polo shirt featuring an Italian flag, could have been mistaken for Manchester City's Italian footballer Mario Balotelli.

Jamaican Bolt, who holds the world records in the 100 and 200 metres, said he intended to take up football when he retires.