ROME (AP) _ Giro d'Italia champion Ivan Basso faces doping allegations after the Italian Olympic Committee reopened its investigation into the Spanish doping scandal.

CONI summoned Basso on Tuesday to a doping hearing May 2 on charges of having used or attempted to use a banned substance or method.

The 29-year-old Italian was one of 50 riders implicated in last year's Operation Puerto, which led to his exclusion from the Tour de France. Basso's name turned up on a list of cyclists who allegedly had contact with a Spanish doctor accused of running a blood doping clinic in Madrid.

Basso was cleared of involvement by CONI and the Italian cycling federation in October.

It was not immediately clear why CONI's investigation was reopened, but the world cycling federation has urged the Spanish government to do more to identify the riders involved the scandal.

Basso signed a two-year contract in November to ride for the Discovery Channel cycling team.