 Fonseca represented the Uruguay national football team on 30 occasions between 1990 and 1997, scoring 11 goals.He was a member of the team that took part at the 1990 FIFA World Cup, and was also in the squad that won the 1995 Copa América.Fonseca was a quick, opportunistic, and hard-working striker, with good dribbling skills, vision, and a powerful shot from distance.