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The veteran, who played for 28 years in the top-flight, is regarded as one of the all-time greats of goalkeeping.
The federation on Tuesday said Buffon uttered the words which they did not specify while shouting at teammate Manolo Portanova in the 80th minute of Juve's 4-0 win at Parma last month.
Buffon, who made his professional debut for Parma as a 17-year-old in 1995, made his name at Juve, winning nine Serie A and four Coppa Italia titles.