Brazil team official accused of hitting Chile player
Chile's forward Mauricio Pinilla reacts after missing a shot on goal during extra-time of the Round of 16 football match between Brazil and Chile at the Mineirao Stadium in Belo Horizonte during the 2014 FIFA World Cup on June 28, 2014 - by Juan Mabromata
The incident happened at half-time in Saturday's match which Brazil won on penalties.
Chile's media spokesman Maria Jose said his Brazilian counterpart "hit" Pinilla.
Paiva told Brazilian media there was shoving by both sides as the two teams left the field.
"I was not the only one involved. Pinilla came looking for me and I just defended myself," he was quoted as saying.
"I just pushed him," he added.
"They started to insult us, there was some shoving but no assault," Paiva said.
Television showed images of a tense face-off between Brazil striker Fred and Chile's Gary Medel just before the incident.
FIFA spokeswoman Delia Fischer told a briefing that the governing body's disciplinary commission was looking into the alleged punch.