Felix Sturm could be stripped off his World Boxing Association super-middleweight belt after failing a drug test following his split decision victory against Fedor Chudinov in February.

Thomas Puetz, the president of the German association of professional boxers (BDB), said Felix tested positive for the anabolic steroid stanozolol after the fight on 20 February in Oberhausen, Germany.

Sturm told the Cologne newspaper Express he was having the B sample tested and hiring a lawyer, while denying any wrongdoing.

Sturm won the fight against the previously unbeaten Chudinov on the cards of two judges, while one ruled it a draw. His victory made him the first German to be a world champion five times, having also held the WBA and WBO middleweight titles.