A banana was thrown onto the field during Brazil’s 2-0 victory over the Scots, while Neymar accused some spectators of racist behaviour - a claim repeated by team-mate Lucas Leiva, who retrieved the banana.
Tartan Army spokesman Hamish Husband strongly denied the catcalls were racially motivated.
He said: “The reason Neymar was booed was because we believed he was feigning injury.
“Racism has no place in the Tartan Army and if it did, it would be stamped out immediately because we are self-policing.”
Fifteen Madridistas have been tabbed by their national teams for duty in friendlies scheduled for 9 February. Casillas, Arbeloa, Albiol, Sergio Ramos and Xabi Alonso will join Spain, Argentina has called up Garay, Gago and Di María, Benzema and Lass by France, Carvalho and Cristiano Ronaldo by Portugal, Marcelo by Brazil and Özil and Khedira by Germany.