The Santos star failed to make an impact on the score sheet, as the Selecao lost 4-3 to Argentina in New Jersey on Saturday.
"I leave here saddened because we lost. We had opportunities to win the game," the Santos star said after a sellout crowd of nearly 82,000 at MetLife Stadium watched Lionel Messi drive Argentina to a 4-3 victory.
Brazil had not lost to Argentina since November 2010, when a friendly held in Doha, Qatar ended in a 1-0 Albiceleste victory.
Neymar had scored in the last South American Superclásico, a 2-0 home victory over the Albiceleste last year.
Despite the loss on Saturday, Neymar was able to draw positive conclusions from his team, as the Brazilians gear up towards a run in the 2012 Olympic Games in London later this summer.
"We lost the game but our team has played quite well. We've established goals, but sadly, we gave up a goal towards the end and lost the match."
John Rojas contributed additional reporting from New Jersey.
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