Frank Schleck (RadioShack-Nissan-Trek) has appeared again before the Luxembourg Anti-Doping Agency (ALAD).
Schleck, 32, tested positive for the diuretic, Xipamide, during the 2012 Tour de France, from which he voluntarily withdrew.
His B-sample was also returned positive, and he has not raced since.
Schleck denies taking the drug knowingly, claiming it was ingested accidentally or as the result of poisoning.
Schleck had a two-hour hearing last night in Luxembourg, after which he said he had maintained that he was not at fault.
“The investigation is continuing but it’s not over,” he added.
Schleck appeared before ALAD’s disciplinary committee on August 29.
He is a four-time champion of Luxembourg, and finished third in the 2011 Tour de France, behind his brother and teammate, Andy, and winner, Cadel Evans (BMC Racing).
Schleck endured a difficult 2012, whose highlight was second in the Tour de Suisse.
He briefly led RadioShack-Nissan-Trek at the Tour de France, but saw his chances of a high overall placing end with a crash on stage six that cost him more than two minutes and ended the hopes of a host of contenders.
Schleck has participated in RadioShack-Nissan-Trek’s pre-season training camp.