Six-time Olympic gold medalist Usain Bolt has revealed that he has not put a date on his retirement.

There have been suggestions that the Jamaican sprinter would call time on his career following the conclusion of next year's Olympic Games in Rio de Janerio, while others have tipped the 29-year-old to continue through to London's World Athletics Championships in 2017.

Bolt has admitted that he will hang up his spikes after one of those events, but he has not yet decided which it will be.

"I start training next week and that will be my main focus because it's an Olympic year," he told reporters.

"Me and my coach have been discussing when I should retire. After the Olympics he says that we shouldn't say no or yes [right now]. After the Olympics we will decide if we should continue for one more year or not."

At the recent World Championships in Beijing, Bolt won gold in the 100m, 200m and 4x100m relay.