The theory that Collingwood pair Lachie Keeffe and Josh Thomas could have eaten beef contaminated by clenbuterol in New Zealand has been rejected by the NZ beef industry.
Keeffe and Thomas, who play in the AFL, tested positive to the banned drug several days after returning from a week-long training camp in Queenstown, New Zealand, where they reportedly ate out several times, including a steak meal.
Australian cyclist Michael Rogers was cleared after testing positive to clenbuterol in 2013 when authorities accepted he could have eaten contaminated meat while racing in China two months earlier.
While clenbuterol is used in livestock in some countries, New Zealand beef industry association chairman Bill Falconer was adamant that was not the case in his country.
"It's just not something that has cropped up in New Zealand," Falconer told Radio 3AW.
"Obviously you can read stuff to say that there had been rumours of it happening in China and Spain but not in New Zealand."