Neymar's last game for Santos comes Sunday against Flamengo as the Brazilian season's opening weekend began.
"It did not go as I had expected or wanted, " the 21-year-old Neymar told reporters.
CNN: World Cup hosts Brazil have work cut out to win sixth title
Neymar himself said he had always targeted a move to Barcelona despite the attempts made by their great rivals Real.
Whether Neymar will still be plying his trade in Brazil when the four-yearly tournament comes around is unclear.
Jadson and Leandro Damiao went close before Neymar fired Brazil in front near the end of the first half.
"My feelings for the club and the fans will never change, " Neymar said.
In other Olympic action, Brazil beat Belarus 3-1 at Old Trafford, thanks to goals from Alexandre Pato, Neymar and Oscar.
"The operation has been made more expensive due to the interest of other clubs that interfered in the signing of Neymar, " he said.
Neymar, the current South American player of the year, revitalized Santos, Pele's former club, scoring 138 goals in only 229 matches.
Brazilian striker Neymar gave Barcelona fans a taste of what's in store, using his quickness to create several shots on net.
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But Neymar's decision to move to Europe just one year ahead of the World Cup isn't without a degree of risk.
Neymar, 21 years old, will consider the competing offers before making a final decision in the coming days, Santos FC said.
Last week, Neymar signed a five-year deal with the Spanish club after a heated bidding war between Barcelona and rival Real Madrid.
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With Neymar expected to move on when his contract was due to expire next year, a transfer to Europe was widely anticipated.
But Neymar is not letting himself get distracted by dreams of glory.
Neymar -- whose full name is Neymar da Silva Junio -- signed a deal that is set to keep him at the club until 2018.
Brazil are expected to include 20-year-old Santos star Neymar in their squad.
"I think Neymar still has a phase to compete -- to play in Europe and triumph playing in Europe, " added the Brazilian great.
For years it sold its best players to European teams, like most Brazilian clubs, but with the 19-year-old Neymar, Santos made an exception.
But Silva says Neymar will only prove successful when his critics allow him to get on with what he does best -- playing football.
The attacking trio of Oscar, Neymar and Hulk provided a real threat, while Ramires and Paulinho had recently shone in the center of midfield.
One man who could prove intrinsic to Brazil's success is the precociously talented Neymar -- largely considered to be one of world football's hottest properties.
The man charged with harnessing Neymar's talent is coach Luis Felipe Scolari -- the mastermind behind Brazil's last march to World Cup glory in 2002.
"My family and friends already know my decision, " read the statement from Neymar, 21, who will play his final match for Santos against Flamengo on Sunday.
"Santos FC announces that it has received two proposals for the athlete Neymar da Silva Santos Junior, " the club said in a statement on its website.
"Our biggest star nowadays is Neymar and I think people have to have a little bit more respect with the professional that is Ney, " said Silva.
Neymar is also becoming an increasingly important part of the Mano Manezes' Brazil national team, scoring eight goals in his first 16 games for his country.
Despite his appetite for the sights and sounds of Sao Paulo and Rio de Janeiro, Neymar is still working hard to improve all aspects of his game.
"Our biggest star nowadays is Neymar and I think people have to have a little bit more respect with the professional that is Ney, " he told CNN.
However Ronaldo also advised Neymar, who plays for Brazilian club Santos, to sign for a European club and help him join the level Messi and Cristiano Ronaldo are playing at.
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