The vegan diet for his colleagues and fans often referred to as " The Salad" designated goalkeeper started his professional career in 1988 at his native Racing Club Avellaneda. In an Africa tour of his club to Roa infected with malaria in 1990. In 1994 he went to CA Lanús, with which he won in 1996 Copa Conmebol. He then moved to Europe to RCD Mallorca in 1998 and took the club to the Supercopa de España.
In 1998 he was keeper of the Argentine national football team in the FIFA World Cup in France. Roa was doing in the first round tight at the back and took in the second round on penalties, in which he, remarkably, saw a yellow card, with two held shots of Paul Ince and David Batty for the resignation of the English team.
After the tournament, Manchester United showed interest in Carlos Roa and offered his club one of millions. But Roa declared 1999 on surprising his retirement from the sport, because he saw no more able to be a member of the Seventh- day Adventist Church to play on Saturday ( Sabbath ).
2000 target Roa but back to the stadium and moved from Mallorca to the Spanish mainland to Albacete Balompié. Roas comeback but was stopped by a testicular cancer disease. After lengthy treatment and recovery Roa was from 2004, first as a goalkeeper coach in the Spanish Segunda División B of the third act, and returned in 2005 as keeper of Olimpo de Bahia Blanca in Argentina's Primera División back.