Retired in 2008, Vansevenant was allegedly to be on the receiving end of a package intercepted at Brussels airport two weeks ago by customs officials. According to reports, the package contained "ultra-modern doping products" designed to increase muscle mass and performance.
Francis Clarysse, Ghent public prosecutor and coordinator of the special combined Hormones Unit investigative team would not elaborate on the case confirming only that: "there is an investigation."
Vansevenant, 39, is due to escort VIP guests of the Omega Pharma-Lotto team at the Tour de France, which begins next week.
The Belgian is the only rider to have finished as lanterne rouge in the Tour de France, three times (2006, 2007, 2008).
Australian Customs and Border Protection Service has been contacted for comment.