Marat Safin has challenged Andre Agassi to give back his titles and prize money as a sign of his remorse.

The American, who won eight grand slam titles and earned more than US$30million in prize money during his distinguished career, revealed in his newly-released autobiography, 'Open', that he failed a drugs test for crystal meth in 1997 then lied to avoid a ban.

Agassi has listed guilt and a desire to help others who may be tempted by drugs as the reasons behind his shock admission, but Safin wants the 39-year-old to prove his sincerity.

"He feels guilty? So let him just give back his titles, money, his grand slams," the outspoken Russian told L'Equipe.

"If he is about fair play, he should go all the way. The ATP have a bank account, he can refund the money if he wants to.

"What's done is done. He hopes to sell more books. But he is completely stupid," added former world number one Safin, who is playing in his final tournament before retirement at the Paris Masters this week.

"I'm not defending the ATP but what he said put them in a bad position. The ATP allowed him to win a lot of tournaments, to make a lot of money.

"They kept his secret so why be so cruel with them? There are times you need to be able to shut up."