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A WBA spokesman confirmed the organisation had no information on Botha's reported positive test following the fight against Williams in Brisbane, Australia.
The WBA spokesman said the Botha/Williams fight had not been recognised for the organisation's international heavyweight title, due to the organisers' decision to reduce the bout from 12 to 10 rounds at late notice.
While Botha was well ahead on points on all three judges' scorecards after 10 rounds, Williams - the current New Zealand heavyweight boxing champion - appeared to be tiring visibly at that point. Botha claimed he would have achieved a knockout had the fight gone two extra rounds.
"I have been badgering Williams and his handlers for a rematch," said Botha, who has fought against the likes of Lennox Lewis, Wladimir Klitschko, Mike Tyson and Evander Holyfield during his colourful 61-bout career.
"But I'm tired of waiting for a reply, and so I've had to look elsewhere to keep in shape. I'm big news in New Zealand now as a result of the fight against Sonny Bill and I'll take on anything the country has to offer."
Botha added he had been offered a purse in excess of R1 million for the Parker fight, with the promise of "good money" and further contests against New Zealand boxers.
Parker is regarded as the most promising heavyweight fighter in New Zealand. The youngster had fought only four times in the professional ranks, albeit winning the fights in impressive fashion.
