Bolloyev resigned yesterday for health reasons and has been replaced by Sergei Gaplikov, the deputy head of the Executive Office of the Government of the Russian Federation.

But there were reports in Russia that it was linked to corruption uncovered in connection with Sochi.

Kozak insisted, however, that preparations for Sochi are above suspicion.

"There were no facts presented concerning abuse or corruption at either SC·Olympstroy·or any other authority body, despite the close scrutiny from a number of different bodies," he said.

"The Olympstroy security service has revealed some violations and passed them to the relevant law enforcement bodies.

"However, these cases have nothing to do with corruption."

Kozak also expressed his confidence in Gaplikov to successfully continue the preparations on the $12 billion ($7.5 billion) programme.

"I can say that Mr Bolloev's departure will not affect the implementation of the Olympic project in any way," Kozak said.

"The project remains unaffected because a solid management system has been established at SC Olympstroy.

"The team has been assembled who are able to address the challenging task ahead of them, helping to ensure that the preparations for the Games are delivered on time.

"The newly appointed head of Olympstroy will not lead to revolutionary employee changes within SC Olympstroy.

"I am delighted to be able to announce as Mr Bolloev's replacement Sergey Gaplikov, whose candidacy I have personally proposed.

"The appointment was made following thoughtful and balanced consideration.  "s a deputy of the Chief of the Government Staff of the Russian Federation, he has been a key figure in the supervision of the implementation of the Olympic project.

"Before that he worked as a head of the Government of the Chuvash Republic.

"This new position will demand great courage and energy from him but I am confident that his experience and professionalism should help him to be successful in delivering the project."

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