Uruguay coach Oscar Tabarez has left his role with FIFA's Technical Study Group.
Tabarez made the decision in protest at the "excessive" four-month ban imposed on Liverpool striker Luis Suarez.
In a 15-minute statement read out at a press conference in the Maracana, Tabarez launched an attack on FIFA for giving Suarez a lengthy ban for biting Italy's Giorgio Chiellini.
Tabarez told a packed-press conference room in Rio: "It is not wise or prudent to be in an organisation with people, those who exerted pressure to promote this decision and those who rendered the award, who managed procedures and values very different to those I have.
"Therefore, in the coming days, I will file my resignation to that position formally."
The Uruguay coach said English reporters who were present at the match - and asked him about the incident after - stoked up the issue, which led to such a big punishment from FIFA.
"(It is) a decision which, obviously, is much more focused on the opinions of the media - the media who immediately drew their conclusions at the game - the journalists who concentrated solely on that topic at the post-match press conference," Tabarez said.
"I don't know what their nationality was, but they all spoke English.
"They concentrated on the history of Luis because of things that happened in the past.
"He was sanctioned, he complied with these sanctions, in the past."
In another part of Tabarez's lengthy ramble, the Uruguay coach claimed FIFA should have punished Chiellini even though he was the one that was bitten.
"We saw the (images of the bite) afterwards and saw that there was a certain possibility of punishing the participants in that action: both Chiellini and Suarez. Both would be punished," he said.
"I don't deny that we were waiting a punishment. But we never imagined the severity of the punishment meted out."
Tabarez then went on to claim FIFA was biased against Uruguay.
"We have seen things measured with a different meter," he said. "Things are measured with a different rod, which leads to exaggeration with the punishment."
