Warsaw - European swimming bronze medalist Sebastian Szczepanski was on Monday linked to a failed drugs test by Poland's anti-doping commission.
"We discovered anabolic steroids, androgens and hormone modulators, but for the moment I'm remaining cautious about judging this case," the commission's Michal Rynkowski told TVN24 television.
"We're waiting on the B sample and the initial explanations from the sportsman," he added.
The 21-year-old Szczepanski, who has already been suspended for doping, faces a ban of between four and eight years if found guilty, Rynkowski said.
The swimmer who took 50m and 100m bronze at the short course championships in December was banned for six months when he was competing as a junior.
The most recent samples were taken at the December 17-20 Polish Championships in Lublin where he won the 100m freestyle gold.