( CNN ) -- Two days after fellow Jamaican sprinter Sherone Simpson received an 18-month doping suspension , former 100-meter world-record holder Asafa Powell was hit with the same penalty after testing positive for the same banned stimulant . He called the ruling `` unfair '' and `` patently unjust . '' Powell confirmed Thursday in a statement sent to CNN through his agent Paul Doyle , that he had been sanctioned for having oxilofrine in his system . As in the case of Simpson -- who won gold in the 4x100-meter relay at the 2004 Olympics -- Powell plans to appeal the decision made by Jamaica 's anti-doping disciplinary panel to the Court of Arbitration for Sport . `` This ruling is not only unfair , it is patently unjust , '' the 31-year-old Powell said in the statement . `` Panels such as these , I understood , were assembled to allow athletes who , consciously or unconsciously , come into conflict with the rules of sport , a chance at equitable redemption . `` Unfortunately , this was not the case . '' Doyle said Tuesday that Simpson , 29 , took a supplement which did n't list oxilofrine as an ingredient and Powell made the same defense . They are former training partners , The Jamaican Gleaner newspaper reported . Like Simpson , Powell tested positive at last year 's Jamaican national championships and wo n't be allowed to return to competition until late December , with his ban backdated to last June . He could have been banned longer . `` I took a legal supplement -- Ephiphany D1 , '' Powell said . `` As it turns out , that supplement was contaminated with oxilofrine . My team commissioned two private laboratories that confirmed that oxilofrine was present in the supplements , despite it not being listed as an ingredient on the bottle nor on it 's website . `` I would also like to share that upon realizing that the supplement contained oxilofrine my team made contact with both the World Anti-Doping Agency ( WADA ) and The United States Anti-Doping Agency ( USADA ) , who not only ordered samples of the supplement from the manufacturer , but also tested and confirmed our findings . '' Powell held the world record in the 100 meters for three years prior to countryman Usain Bolt breaking it . Besides once being the fastest man in the world , Powell teamed with Bolt and two others to claim gold in the 4x100-meter relay at the 2008 Olympics . He is also a two-time bronze medalist in the 100 meters at the world championships . It was the first time in nearly 12 years and more than 150 tests , Powell added , that one had an `` adverse '' finding . `` It is for a stimulant ... a stimulant that is only banned during competition and experts have declared has no performance enhancing effects , '' he said . `` Sanctions for a stimulant and this kind of infraction usually range from public warnings to a ban of three months , six months in the most extreme cases ; I was and am still more than prepared to accept a sanction that is in line with the offense . `` Instead nine months later what has been handed down is clearly not based on the offense nor the facts surrounding it . `` I want to reiterate that I have never knowingly taken any banned substances , I did all the necessary checks before taking Ephiphany D1 . '' When contacted by CNN , WADA said it would review the reasons for Thursday 's decision before deciding whether it would appeal .
Asafa Powell receives an 18-month suspension for testing positive for banned stimulant . Powell given the same punishment as fellow Jamaican sprinter Sherone Simpson . Like Simpson , he plans to take his case to the Court of Arbitration for Sport . Powell held the world record in the 100 meters before Usain Bolt broke it .