He's the greatest athlete of all time who could be forgiven for wanting to kick up his feet and enjoy his retirement.

But Usain Bolt believes his sporting career is only just getting started, as he revealed he is fielding offers from several clubs to become the next football star.

Despite being a rookie in the sport, the eight-time Olympic champion has set the bar high, saying he plans to play for one of the biggest teams in world football - Manchester United.

Usain Bolt (pictured with Sir Alex Ferguson) believes his sporting career is only just getting started and plans to play for Manchester United

Big fan: Usain (centre) has long been an admirer of the English giants and has let it be known he has his sights set on a new career there

Usain - who was in Sydney on Friday to launch an Optus store in the city centre - has long been an admirer of the English giants and has let it be known he has his sights set on a new career there.

'One of my biggest dreams is to try play for Manchester United and play football, it's something that's on my mind,' he told The Saturday Telegraph.

He added: 'My big dream would be to play for Manchester United because it's my favourite team since I was young, but there are other teams in the Premier League I'd definitely want to try.'

In the works? Usain met Manchester United legends including Sir Bobby Charlton (pictured) last month

The 31-year-old said he has 'a lot' of different offers from teams that he has considered.

But he has to overcome a hamstring injury he sensationally sustained in his final race last month, before he can consider them.

'It's (football) something I always said I'd be good at and something I feel I should try post-retirement,' he said.

Known as 'the fastest man alive', Usain said he only intends to truly slow down once he has children.