Men's World 100 metres record holder Usain Bolt has again expressed his interest in doubling at the Olympic Games in Beijing next month.

Speaking to reporters on the eve of the two day Aviva London Grand Prix meeting, the lanky Jamaican acknowledged he is targeting the 100 and 200 Olympic gold medals, but understands that his coach knows best.

"I definitely want to double," Bolt said. "This is an Olympic year, and you have to take it seriously. But I don't know what I'll be doing - that's up to my coach."

After breaking compatriot Asafa Powell's World record of 9.74 seconds with his scorching run of 9.72 secs in New York on May 31 this year, Bolt announced that he would definitely go after the double in Beijing.