Luis Suarez was banned three times for biting players, but a surprise report claims he was investigated eight times.
The Uruguay striker received a four-month ban for clamping his jaws on the shoulder of Italy defender Giorgio Chiellini.
It was the third time he has been caught on camera biting an opponent after incidents during his time at Ajax and Liverpool.
Now the Daily Star maintains FIFA have investigated another five incidents of biting during the 27-year-old’s career.
These date back to Suarez’s early professional career at Nacional de Montevideo.
“FIFA have not only taken into consideration this bite and two previous incidents when they handed Suarez a four-month ban from football,” a source is quoted as telling the Daily Star on Sunday.
“They are also aware of other alleged biting incidents from his early professional playing days. There are people who have come forward to FIFA with details.
“There are allegations of five attacks but whistleblowers have told FIFA they were covered up because football officials in Uruguay did not want it known that their star asset was involved.”
Suarez received a seven-game ban in November 2010 for biting PSV player Otman Bakkal while he was at Ajax.
Last year the Liverpool striker was suspended for 10 games after he was caught on camera biting Chelsea defender Branislav Ivanovic.
In all of these incidents, Suarez was not spotted by officials at the time and only punished using video evidence.