Olympic chief Jacques Rogge vowed no let up in the war on illegal betting and doping as the International Olympic Committee began its three-day session ahead of the London Games.

The 70-year-old IOC president, who is due to step down in September next year after a 12 year tenure, said the battles against the twin threats should also come with good and responsible governance of all sports.

"The fight against doping and illegal gambling remain the absolute priorities for the IOC," said Rogge.

"In the battle against doping we will increase tests before and after Games with targeted testing and get NOCs (National Olympic Committees) to increase tests during the Games and we will also test samples that have been taken at previous Games.

"In terms of irregular betting and match-fixing we will rely on in depth monitoring and communicate with bodies such as the Gambling Commission based here in Great Britain, Interpol and NOC's among others.

"We are fighting against threats that sport face but also good governance of sport is crucial. Sports organizations should have rigorous internal and external audits."