Former Olympic race walking champion Alex Schwazer is facing another doping case, but this time he maintains he is clean.

SOUNDBITE (Italian) Alex Schwazer, Italian race walking champion accused of doping

"Like four years ago, here I am again, putting my face to it, out of respect for myself, and for those who were close to me then, and are close to me now. But today there will not be apologies, I do not have to apologise for any mistakes, mistakes I did not make. Four years ago I made a mistake, this time I didn't."

SOUNDBITE (Italian): Gerhard Brandstaetter, Alex Schwazer's lawyer

"Everybody knows that we were also put under huge pressure, from those who tried to make it difficult for Alex to return to competition. And now we will try to get to the bottom of this. We hope and we wish, in order to find the truth about this incident, an incident that we can only define as ugly and dishonest."