FIFA president Sepp Blatter said accusations security officials pulled guns and beat players at the final of the Copa Sudamericana in Brazil is a warning to organizers as the country prepares to host the 2014 World Cup.
Blatter said: "Such an incident that has just happened is a warning for organizers of the World Cup of what can happen.''
Sao Paulo was awarded the title when Tigre refused to take the field for the second half of Wednesday's second leg of the final. Sao Paulo was leading 2-0.
Officials of the Argentine club said players and staff were beaten by security officials in the dressing room area at halftime and guns were drawn. The trouble off the pitch followed scuffles between the teams at the end of the first half.