I have come across this gif on Facebook, where the goal-keeper of the opposite team disproves the injury of a player (I'm not sure about what match it was).
So, would players who get disproved of injury be fined?
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Disciplinary action has certainly been taken over players who have been shown to feign injury. One of the most infamous instances of this was at the 2002 FIFA World Cup; during a group match between Brazil and Turkey, when Rivaldo went down covering his face after being struck on the hip by a ball kicked at him by a Turkish player. The referee sent off the Turkish player for a second yellow-card offence, but upon video review – which clearly proved the Brazilian’s cheating intent – Rivaldo was fined by FIFA.
In 1989, a match between Brazil and Chile was abandoned after the Chilean goalkeeper Roberto Rojas appeared to be injured by a flare thrown onto the pitch by a spectator. The 1989 World Cup qualifying incident resulted in more than just the play-acting player being punished.
Video evidence later showed that Rojas had not been hit by the firework. His head injury was discovered to have been self-inflicted with a razor blade hidden in his glove. FIFA awarded Brazil a 2-0 win, effectively eliminating Chile from the 1990 World Cup. As a consequence, Chile was banned from the 1994 FIFA World Cup and Rojas was banned for life, along with the coach Orlando Aravena and the team doctor Daniel Rodriguez.