The South Americans opened their campaign in the Mexico-based tournament with a 1-1 draw, but the trainer rued missed chances and stated that a win was there for the taking
Henrique Nascentes had given the Youth World Cup holders the lead in the second half, before a well-timed volley from Boca Juniors youngster Sergio Araujo sealed an equaliser for the Argentines and ensured that the fiercely fought clasico would end in a tie.
Speaking after the match, Perazzo recognised that his team could have taken even more from Wednesday evening's meeting.
"We could have won. After the goal we had chances to take the game," the coach lamented to reporters in the post-match press conference.
"In the first half we saw two teams colliding with each other. In some passages we were better, but it was not good. The team understood their game, however, and in the second half showed that they were going to play. They did not despair at 1-0 and we always tried to play our way through on goal."
Araujo was the goal hero for the Albiceleste, but blotted his copybook by getting sent off late in the game following an ugly clash with Romario de Moura. Perazzo, however, defended the young striker.
"It was a confused clash and it looked like the Brazilian hurt him. [Araujo] headed backwards and hit him accidentally," he argued.
Elsewhere in the tournament, hosts Mexico defeated Ecuador 2-1 while Costa Rica enjoyed a 1-0 win over Cuba.