Rio de Janeiro (AFP) - Polish weightlifter Tomasz Zielinski has been banned from Olympic competition after testing positive for the anabolic steroid nandrolone, Poland's PKOL Olympic Committee said Tuesday.
The drug was detected in blood drawn from Zielinski, who was due to compete in the 94 kilogramme category, on July 31 as he arrived in Brazil.
The 25-year-old European champion has denied any wrongdoing and vowed legal action.
President of Poland's weightlifting federation Szymon Kolecki -- gold medal winner in Beijing -- stepped down in connection with the incident.
"I'm sorry for and ashamed of what has happened," he told reporters in the Polish capital Warsaw.
Zielinski trained for the Olympics individually, outside the framework established by the Polish federation.
Kolecki decided in June not to include him in Poland's Olympic squad, but was over-ruled by the federation board.