Brazil striker Neymar claimed after Sunday's friendly against Scotland that he had been subjected to racist abuse.
Neymar scored both goals in the encounter at Arsenal's Emirates Stadium to secure a 2-0 victory for Brazil.
Having opened the scoring just before half-time, he doubled Brazil's lead with a 77th-minute penalty after being fouled by Charlie Adam.
But after the final whistle he told Brazilian television channel Sportv that while he had been preparing to take the spot-kick he had been racially abused.
The channel reported that a banana was thrown at him toward the end of the second half from a section of the crowd mostly populated by Brazil fans.
"They were jeering me a lot, even when I was about to kick the penalty," Neymar told Sportv.
"The entire stadium was jeering. This atmosphere of racism is totally sad. We leave our country to play here and something like this happens.
"It's sad. I'd rather not even talk about it, to keep the subject from escalating."
Scotland supporters had jeered the Santos striker following a first-half clash with midfielder Scott Brown.
Neymar's on-field treatment after the apparently innocuous incident held up play and he was then slow in making his way to the sidelines as the referee tried to restart play.
"The reason Neymar was booed was because we believed he was feigning injury during the course of the game," said Hamish Husband, spokesman for Scotland fans' group Association of Tartan Army Clubs.
"Racism has no place within the Tartan Army and if it did exist it would be stamped out immediately as we are self policing.
"We felt he was feigning injury and any suggestion of racism amongst our supporters is absolute tosh."
Husband added that Scotland fans had previously reported a supporter at Glasgow's Hampden Park stadium to the Scottish Football Association for racist abuse.
"We accepted that Brazil played us off the park and we applauded them for the quality of their football at the end of the game," Husband said. "We would not tolerate it if it existed within our ranks."
Brazil coach Mano Menezes and Scotland's Craig Levein both said they did not see the incident.
"I did not see that," Menezes said. "If it happened, it is lamentable, but we have not had confirmation of that event."
Sportv reported that Brazil midfielder Lucas Leiva picked up the banana from the pitch.
"There is no more space for racism in the world," Lucas told Sportv. "They say it's the first world here in Europe, but it's where it happens the most. That has to change. Everybody is equal today. It's a matter of respect."