"In no way it happened how you have described, as a bite or intent to bite," the Uruguay striker wrote in Spanish in a letter dated June 25.
The player's defence is in paragraph 6 of FIFA's disciplinary committee ruling, which has been seen by The Associated Press.
"After the impact ... I lost my balance, making my body unstable and falling on top of my opponent," Suarez wrote in his submission to the panel which met Wednesday, one day after Uruguay beat Italy 1-0 in a decisive group-stage match.
"At that moment I hit my face against the player leaving a small bruise on my cheek and a strong pain in my teeth," Suarez said.
However, the seven-man panel which met on Wednesday evening dismissed the argument.
The bite was "deliberate, intentional and without provocation," the ruling stated in paragraph No. 26 of the panel's conclusions.
Suarez was banned for nine Uruguay matches and four months from all football. He was also fined 100,000 Swiss francs ($112,000).
The panel, chaired by former Switzerland international Claudio Sulser, included members from the Cook Islands, Hong Kong, Pakistan, Panama, South Africa and Singapore.
The ruling confirmed that referee Marco Rodriguez of Mexico acknowledged in his match report that he missed Suarez's bite. So did his two assistants and the fourth official.
"I haven't seen the incident because the ball was in another sector of the pitch," Rodriguez writes in paragraph No. 4 of witness submissions in the 11-page document.
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