The incident occurred as Palmeiras prepared to take a corner in the first half and Corinthians forward Yuri Alberto ran from the penalty box to kick it off the pitch before play continued.
Alberto went on to score as Corinthians won the game 2-0.
A pig's head was thrown on to the pitch during a game between Sao Paulo rivals Corinthians and Palmeiras in the Brazilian championship.
https://www.bbc.co.uk/sport/football/articles/c0lpnr99986o