Dopingskandal Fuentes
In 2005, Vega was suspended for two weeks after being tested with a hematocrit level above 50 before the start of Dauphine Libere. In 2006, he was initially implicated in the Operación Puerto doping case, but was cleared of any wrongdoing by Spanish officials. He later admitted his involvement, saying he did three blood transfusions with Fuentes in the season before the 2005 Dauphine Libere, but denying he doped.