The UCI announced Thursday that it has provisionally suspended Oscar Sevilla after the Spanish rider tested positive for hydroxyethyl starch in a urine sample collected last month at the Vuelta a Colombia.
HES, a banned substance, can be used as a blood plasma substitute.
The provisional suspension will remain in force until a hearing panel convened by the Spanish Cycling Federation determines whether Sevilla has violated anti-doping rules, the UCI said.
Sevilla has the right to request and attend the analyses of his B sample, the governing body added.
Sevilla was previously linked to the Operación Puerto case in Spain and prevented from racing in the 2006 Tour de France. He was then fired by his German team T-Mobile.
At the 2001 Tour he led the best young rider classification and finished seventh overall. The 33-year-ld Spaniard has raced with the Kelme, Phonak, T-Mobile and Rock Racing teams during his career.