Filipino superstar boxer Manny Pacquiao is threatening defamation suit against American Floyd Mayweather Jr. and several other people on the latter’s camp, jeopardizing their much-anticipated fight scheduled on March 13.

Mayweather and his promoters reportedly suggested that Pacquiao rejected their proposed random drug testing prior to the fight because he was taking steroids.

In response, the furious Filipino boxer said he would file defamation suit against the American boxer, his father Floyd Mayweather Sr. and his uncle Roger Mayweather as well as Oscar De La Hoya and Richard Schaefer of Golden Boy Promotions, leaving the boxing fans to doubt whether the March 13 super fight would still be held.