Powell tested positive for the banned stimulant oxilofrine at the Jamaican National Championships in June.

However, Xuereb rejected claims from agent Paul Doyle that the results were due to supplements he had provided.

"I did not provide any banned or illegal substances," insisted Xuereb.

"I am extremely disappointed that these athletes have chosen to blame me for their own violations."

Xuereb said his main role was "to provide soft tissue massage therapy as well as nutritional help" to Powell and Simpson.


Doyle yesterday indicated that the supplements provided to the athletes by Xuereb lay behind Powell and Simpson both testing positive.

"We were trying to figure out what went wrong and it was pretty obvious to us where we needed to look," Doyle told the New York Times.

"There are many different things he was giving them and we still don't know which one caused the positive test.

"Most of the supplements he gave were for recovery or energy during workouts."

The 30-year-old Powell has denied he knowingly took any banned supplements or substances.

"It is time the athletes took responsibility for their doping instead of looking around for a scapegoat, whether that person is their therapist, bartender or anyone else," said Xuereb.

"While I did recommend vitamins, all vitamins recommended by me were all purchased over the counter at reputable nutritional stores and were major brands.

"These athletes did not inform me that they were taking any additional supplementation other than what I recommended."

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