The wife of the doctor at the centre of the `Operation Puerto` doping affair said she could bring down Spanish sport if she revealed all to which she was privy.

In an interview with La Provincia newspaper, the wife of Dr Eufemianio Fuentes, Cristina Perez, a European 400m bronze medallist in 1987, said: `I know what happened at the Barcelona Olympics in 1992.`

Perez said `many Olympic medals` were won by Spain thanks to her husband. Spain won a record 13 gold medals at the Barcelona Games.

`It`s a Pandora`s Box and if opened one day, it could bring down sport,` Perez said.

`But out of respect for my companions, to the people who sacrificed so much, I`m keeping mum although I could speak out and ruin all those caught up in this little world.`

Fuentes is reported to have been the mastermind of a vast blood doping network, which was dubbed `Operation Puerto` in May 2006 following a police raid on his Madrid laboratory which uncovered doping products and blood bags.

While names of around 200 `clients` from the world of sport were reportedly found, only a few have been sanctioned.

Perez, 43, herself suspected of doping at the Seoul Olympics in 1988, defended her husband, saying he had been a victim of a campaign by the Spanish government.

`To call a doctor dedicated to sports science who has killed no one a criminal mastermind seems shameful to me.