Disgraced former dual international Andrew Walker has apologised for taking cocaine, saying he got caught in "a moment of madness".

The Manly rugby league star tested positive to an Australian Sports Drug Agency (ASDA) random drug test after an August 22 match against Souths at North Sydney Oval, Sydney's Daily Telegraph reported.

"I was out with friends or I thought were my friends," he told the newspaper.

"I feel so hurt by what I've done.

"I'm sorry I've done it. This has stung me to the heart."

The drug was consumed by Walker at a party where he had been drinking despite signing an agreement with Manly that he would not consume alcohol, the paper said.

"It was one moment of madness, one blemish and I got caught," he said. "I've been strong in the past but I collapsed and have let myself down.

"I was out with friends or who I thought were my friends. Real friends wouldn't have brought it (the drug) out.

"But it takes two to tango. I feel so hurt by what I've done. I am sorry but I have done the crime. I'm not walking away from what I've done."

Walker, who starred for the Wallabies before being axed for disciplinary reasons and returning to league, said his friends thought it was a good thing to have a party.

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