The Belgian cycling federation for doping has banned Johan Museeuw, Chris Peers and Jo Planckaert for four years.
Museeuw was world champion in 1996 and twice a World Cup winner
None of the three failed a test but all have been implicated in the trafficking ring run by vet Jose Landuyt.
Museeuw, 38, has already retired but Planckaert and Peers are still on the professional circuit. In each ban case 24 months are suspended.
Filip Meirhaeghe, who quit mountain biking after failing an EPO test in June, was also banned for four years.
Museeuw appeared in August before the Belgian cycling authorities after being questioned by police about a prescription drug found when they raided his house over a year ago.
Police searched 20 homes in all after Landuyt was suspected of supplying hormones to cyclists. Landuyt does not come under the association's powers and has not been sanctioned.
Museeuw retired in April after 16 years as a
professional with 11 classic victories.
Since then he has been acting as a public relations officer for his former Quickstep-Davitamon team.
body the UCI must now decide whether he can continue in the role.
"That is a question only the UCI can answer," said Belgian
association spokesman Tom van Damme.