L'actualité du dopage
All eight Giro entries from Spanish team Ibanesto.com are also reportedly under suspicion.
Two Ibanesto managers and a team doctor are among two dozen non-racers being investigated for doping violations.
Four racers for the Lampre team, whose lead rider Gilberto Simoni won the three-week event, are also being quizzed.
Gilberto Simoni has already been cleared of any wrongdoing.