INTERNATIONAL Olympic Committee president Jacques Rogge has admitted it would be “naive” to think that there will be no doping at this year’s London Olympics.

There are set to be 5,000 drugs tests at this year’s Games, 10 per cent more than in Beijing four years ago, but Rogge believes some athletes could still try to cheat.

“There have been positive cases in each Olympic games since we have started testing,” said Rogge.

“To say there will be no positive cases would be naive and misleading.

“I hope it’s the case, but reality tells me that there may be positive cases.”

A high-tech laboratory will operate 24 hours a day, which will allow the authorities to get as close as possible to wiping out the problem.

“Everything that is humanly possible has been done in London to minimise doping,” he said.

“We hope that it will be the lowest possible number and we do everything we can to protect clean athletes.”