The Manchester City midfielder could reportedly be banned for two years by the French Football Federation (FFF) for his actions after Les Bleus' 2-0 quarter-final loss to Spain.
However, the Uefa president and former France captain has come out in Nasri's defence, and says that being excluded from international duty until after the 2014 World Cup would be heavy-handed.
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"If I had been suspended every time I insulted a journalist, I wouldn't have had many caps in the national team," said Platini, according to France Football.
"Nasri deserves something, but a suspension for two years is ridiculous and shameful."
The 25-year-old playmaker clashed with the press throughout Euro 2012, and celebrated his goal in the 1-1 draw with England by gesturing towards L'Equipe journalists.