South Africa and Stormers flanker Schalk Burger was found guilty by a SANZAR judiciary on Monday of bad sportsmanship against a touch judge in a weekend Super 14 match.
The sentence will be announced on Tuesday.
The judicial committee said Burger acted "contrary to good sportsmanship" when he mocked tough judge Willie Roos' eyesight by forming his hands to appear like glasses.
Burger was late to a fracas in the Stormers-Sharks match at Durban on Saturday and reported by Roos to referee Kelvin Deaker, who yellow-carded the former world player of the year. Burger gestured at Roos as he walked off the field.